Dear Experts,

I'm struggling to solve SOAP Integration issue, please help me out.

Requirement: in Lead Object, to calculate the vehicle milage from starting postcode to destination postcode I'm integrating salesforce with 3rd party application which takes both post codes and calculated the distance in meters and returns. Then the milage value must be inserted in lead record.

Below is the code, but the error encountering stating can't update the record...can some one please help.

Trigger:
Trigger DistanceCalc on Lead(after update){         
Lead currentRecord = Trigger.old[0];   
DistanceCalc.webServiceCal(currentRecord.id);     
}

Helper Class
global class DistanceCalc {
    
  @future(callout=true)
    public static void webServiceCal(ID leadId){
    
     Lead weblead = [select id,Pick_Up_Post_Code__c,Destination_Postal_Code__c,Distance_miles__c from lead where id=:leadId];
     
     try{
             ServicesPostcodeanywhereCoUk.ArrayForWayPoints wpoint = new ServicesPostcodeanywhereCoUk.ArrayForWayPoints();     
            ServicesPostcodeanywhereCoUk.PostcodeAnywhere_Soap pcode = new ServicesPostcodeanywhereCoUk.PostcodeAnywhere_Soap();
            ServicesPostcodeanywhereCoUk.DistancesAndDirections_Interactive_Distance_v1_00_ArrayOfResults result = pcode.DistancesAndDirections_Interactive_Distance_v1_00('XXXXXXXXXXNT72',weblead.Pick_Up_Post_Code__c,weblead.Destination_Postal_Code__c,wpoint,'Fastest');
       
        Integer meter = result.DistancesAndDirections_Interactive_Distance_v1_00_Results[0].TotalDistance;
        Integer mile = meter/1600;
        weblead.Distance_miles__c = mile;
          update weblead;
          }catch(system.asyncexception e){          
              system.debug(e);
          }    
    }
}

Error Msg:

19:08:42.075 (75862045)|EXECUTION_STARTED 19:08:42.075 (75894489)|CODE_UNIT_STARTED|[EXTERNAL]|FutureHandler - state load 19:08:42.084 (84355771)|CODE_UNIT_FINISHED|FutureHandler - state load 19:08:42.085 (85895156)|EXECUTION_FINISHED 19:08:42.121 (121106934)|EXECUTION_STARTED 19:08:42.121 (121116616)|CODE_UNIT_STARTED|[EXTERNAL]|01p250000009btj|DistanceCalc.webServiceCal 19:08:42.121 (121519240)|HEAP_ALLOCATE|[72]|Bytes:3 19:08:42.121 (121607696)|HEAP_ALLOCATE|[77]|Bytes:152 19:08:42.121 (121633884)|HEAP_ALLOCATE|[342]|Bytes:408 19:08:42.121 (121655810)|HEAP_ALLOCATE|[355]|Bytes:408 19:08:42.121 (121676872)|HEAP_ALLOCATE|[467]|Bytes:48 19:08:42.121 (121712120)|HEAP_ALLOCATE|[139]|Bytes:6 19:08:42.121 (121734214)|HEAP_ALLOCATE|[EXTERNAL]|Bytes:1 19:08:42.121 (121740533)|HEAP_ALLOCATE|[EXTERNAL]|Bytes:2 19:08:42.121 (121759073)|METHOD_ENTRY|[1]|01p250000009btj|DistanceCalc.DistanceCalc() 19:08:42.121 (121764487)|STATEMENT_EXECUTE|[1] 19:08:42.121 (121769588)|STATEMENT_EXECUTE|[1] 19:08:42.121 (121774844)|METHOD_EXIT|[1]|DistanceCalc 19:08:42.121 (121781685)|HEAP_ALLOCATE|[EXTERNAL]|Bytes:4 19:08:42.121 (121792289)|VARIABLE_SCOPE_BEGIN|[4]|leadId|Id|false|false 19:08:42.121 (121880156)|VARIABLE_ASSIGNMENT|[4]|leadId|"00Q25000001rN6JEAU" 19:08:42.121 (121896733)|STATEMENT_EXECUTE|[4] 19:08:42.121 (121899444)|STATEMENT_EXECUTE|[6] 19:08:42.121 (121904730)|HEAP_ALLOCATE|[6]|Bytes:108 19:08:42.121 (121917598)|HEAP_ALLOCATE|[6]|Bytes:4 19:08:42.121 (121929301)|HEAP_ALLOCATE|[6]|Bytes:7 19:08:42.121 (121986983)|HEAP_ALLOCATE|[50]|Bytes:5 19:08:42.122 (122018224)|HEAP_ALLOCATE|[56]|Bytes:5 19:08:42.122 (122030120)|HEAP_ALLOCATE|[64]|Bytes:7 19:08:42.122 (122982242)|SOQL_EXECUTE_BEGIN|[6]|Aggregations:0|SELECT id, Pick_Up_Post_Code__c, Destination_Postal_Code__c, Distance_miles__c FROM lead WHERE id = :tmpVar1 19:08:42.128 (128078335)|SOQL_EXECUTE_END|[6]|Rows:1 19:08:42.128 (128104279)|HEAP_ALLOCATE|[6]|Bytes:8 19:08:42.128 (128123657)|HEAP_ALLOCATE|[6]|Bytes:97 19:08:42.128 (128253559)|HEAP_ALLOCATE|[6]|Bytes:8 19:08:42.128 (128266465)|HEAP_ALLOCATE|[6]|Bytes:30 19:08:42.128 (128356443)|HEAP_ALLOCATE|[6]|Bytes:16 19:08:42.128 (128365787)|VARIABLE_SCOPE_BEGIN|[6]|weblead|Lead|true|false 19:08:42.128 (128405376)|VARIABLE_ASSIGNMENT|[6]|weblead|{"s":1,"v":{"Id":"00Q25000001rN6JEAU","Pick_Up_Post_Code__c":"RG215RN","Destination_Postal_C (6 more) ...":"SO140PH"}}|0x359d3954 19:08:42.128 (128412469)|STATEMENT_EXECUTE|[8] 19:08:42.128 (128415233)|STATEMENT_EXECUTE|[8] 19:08:42.128 (128417342)|STATEMENT_EXECUTE|[9] 19:08:42.130 (130272618)|HEAP_ALLOCATE|[9]|Bytes:20 19:08:42.130 (130300242)|CONSTRUCTOR_ENTRY|[9]|01p250000009btZ|<init>() 19:08:42.130 (130346035)|VARIABLE_SCOPE_BEGIN|[10]|this|ServicesPostcodeanywhereCoUk.ArrayForWayPoints|true|false 19:08:42.130 (130421527)|VARIABLE_ASSIGNMENT|[10]|this|{}|0x1ed104d3 19:08:42.130 (130438340)|HEAP_ALLOCATE|[12]|Bytes:6 19:08:42.130 (130456883)|VARIABLE_SCOPE_BEGIN|[2]|this|System.ApexBaseClass|true|false 19:08:42.130 (130474895)|VARIABLE_ASSIGNMENT|[2]|this|{}|0x1ed104d3 19:08:42.130 (130486741)|STATEMENT_EXECUTE|[10] 19:08:42.130 (130489537)|STATEMENT_EXECUTE|[11] 19:08:42.130 (130491759)|STATEMENT_EXECUTE|[12] 19:08:42.130 (130497744)|HEAP_ALLOCATE|[12]|Bytes:4 19:08:42.130 (130540908)|HEAP_ALLOCATE|[12]|Bytes:9 19:08:42.130 (130551103)|HEAP_ALLOCATE|[12]|Bytes:39 19:08:42.130 (130556621)|HEAP_ALLOCATE|[12]|Bytes:1 19:08:42.130 (130560909)|HEAP_ALLOCATE|[12]|Bytes:2 19:08:42.130 (130565120)|HEAP_ALLOCATE|[12]|Bytes:5 19:08:42.130 (130602146)|HEAP_ALLOCATE|[EXTERNAL]|Bytes:28 19:08:42.130 (130623640)|VARIABLE_ASSIGNMENT|[12]|this.WayPoints_type_info|{"s":1,"v":"List of size 6 too large to display"}|0x1ed104d3 19:08:42.130 (130628311)|STATEMENT_EXECUTE|[13] 19:08:42.130 (130633779)|HEAP_ALLOCATE|[13]|Bytes:4 19:08:42.130 (130658227)|HEAP_ALLOCATE|[13]|Bytes:4 19:08:42.130 (130675350)|HEAP_ALLOCATE|[EXTERNAL]|Bytes:16 19:08:42.130 (130692057)|VARIABLE_ASSIGNMENT|[13]|this.apex_schema_type_info|{"s":1,"v":["http://services.post (19 more) ...","true","false"]}|0x1ed104d3 19:08:42.130 (130696879)|STATEMENT_EXECUTE|[14] 19:08:42.130 (130701973)|HEAP_ALLOCATE|[14]|Bytes:4 19:08:42.130 (130734314)|HEAP_ALLOCATE|[EXTERNAL]|Bytes:8 19:08:42.130 (130747801)|VARIABLE_ASSIGNMENT|[14]|this.field_order_type_info|{"s":1,"v":["WayPoints"]}|0x1ed104d3 19:08:42.130 (130754773)|CONSTRUCTOR_EXIT|[9]|01p250000009btZ|<init>() 19:08:42.130 (130759172)|VARIABLE_SCOPE_BEGIN|[9]|wpoint|ServicesPostcodeanywhereCoUk.ArrayForWayPoints|true|false 19:08:42.130 (130783554)|VARIABLE_ASSIGNMENT|[9]|wpoint|{"apex_schema_type_inf (1 more) ...":"0x6e97fb34","field_order_type_inf (1 more) ...":"0x4085a95d","WayPoints_type_info":"0x329c23aa"}|0x1ed104d3 19:08:42.130 (130789502)|STATEMENT_EXECUTE|[10] 19:08:42.131 (131097040)|HEAP_ALLOCATE|[10]|Bytes:2 19:08:42.131 (131122455)|HEAP_ALLOCATE|[10]|Bytes:36 19:08:42.131 (131136582)|CONSTRUCTOR_ENTRY|[10]|01p250000009btZ|<init>() 19:08:42.131 (131162459)|VARIABLE_SCOPE_BEGIN|[46]|this|ServicesPostcodeanywhereCoUk.PostcodeAnywhere_Soap|true|false 19:08:42.131 (131198577)|VARIABLE_ASSIGNMENT|[46]|this|{}|0x5b63217 19:08:42.131 (131207563)|VARIABLE_SCOPE_BEGIN|[2]|this|System.ApexBaseClass|true|false 19:08:42.131 (131224149)|VARIABLE_ASSIGNMENT|[2]|this|{}|0x5b63217 19:08:42.131 (131232480)|STATEMENT_EXECUTE|[46] 19:08:42.131 (131235118)|STATEMENT_EXECUTE|[47] 19:08:42.131 (131239198)|HEAP_ALLOCATE|[47]|Bytes:100 19:08:42.131 (131253007)|VARIABLE_ASSIGNMENT|[47]|this.endpoint_x|"https://services.pos (80 more) ..."|0x5b63217 19:08:42.131 (131256842)|STATEMENT_EXECUTE|[48] 19:08:42.131 (131259088)|STATEMENT_EXECUTE|[49] 19:08:42.131 (131261158)|STATEMENT_EXECUTE|[50] 19:08:42.131 (131263115)|STATEMENT_EXECUTE|[51] 19:08:42.131 (131265102)|STATEMENT_EXECUTE|[52] 19:08:42.131 (131267024)|STATEMENT_EXECUTE|[53] 19:08:42.131 (131268918)|STATEMENT_EXECUTE|[54] 19:08:42.131 (131273747)|HEAP_ALLOCATE|[54]|Bytes:4 19:08:42.131 (131313019)|HEAP_ALLOCATE|[54]|Bytes:28 19:08:42.131 (131331907)|HEAP_ALLOCATE|[EXTERNAL]|Bytes:12 19:08:42.131 (131348326)|VARIABLE_ASSIGNMENT|[54]|this.ns_map_type_info|{"s":1,"v":["http://services.post (19 more) ...","ServicesPostcodeanyw (8 more) ..."]}|0x5b63217 19:08:42.131 (131356043)|CONSTRUCTOR_EXIT|[10]|01p250000009btZ|<init>() 19:08:42.131 (131360355)|VARIABLE_SCOPE_BEGIN|[10]|pcode|ServicesPostcodeanywhereCoUk.PostcodeAnywhere_Soap|true|false 19:08:42.131 (131384076)|VARIABLE_ASSIGNMENT|[10]|pcode|{"endpoint_x":"https://services.pos (80 more) ...","ns_map_type_info":"0x54a937ce"}|0x5b63217 19:08:42.131 (131389526)|STATEMENT_EXECUTE|[11] 19:08:42.131 (131394044)|HEAP_ALLOCATE|[11]|Bytes:19 19:08:42.131 (131435470)|HEAP_ALLOCATE|[11]|Bytes:7 19:08:42.131 (131474632)|METHOD_ENTRY|[11]|01p250000009btZ|ServicesPostcodeanywhereCoUk.PostcodeAnywhere_Soap.DistancesAndDirections_Interactive_Distance_v1_00(String, String, String, ServicesPostcodeanywhereCoUk.ArrayForWayPoints, String) 19:08:42.131 (131639283)|VARIABLE_SCOPE_BEGIN|[55]|this|ServicesPostcodeanywhereCoUk.PostcodeAnywhere_Soap|true|false 19:08:42.131 (131667250)|VARIABLE_ASSIGNMENT|[55]|this|{"endpoint_x":"https://services.pos (80 more) ...","ns_map_type_info":"0x54a937ce"}|0x5b63217 19:08:42.131 (131674838)|VARIABLE_SCOPE_BEGIN|[55]|Key|String|false|false 19:08:42.131 (131681738)|VARIABLE_ASSIGNMENT|[55]|Key|"WW94-FK29-RX91-NT72" 19:08:42.131 (131685725)|VARIABLE_SCOPE_BEGIN|[55]|Start|String|false|false 19:08:42.131 (131690955)|VARIABLE_ASSIGNMENT|[55]|Start|"RG215RN" 19:08:42.131 (131694754)|VARIABLE_SCOPE_BEGIN|[55]|Finish|String|false|false 19:08:42.131 (131699872)|VARIABLE_ASSIGNMENT|[55]|Finish|"SO140PH" 19:08:42.131 (131703577)|VARIABLE_SCOPE_BEGIN|[55]|WayPoints|ServicesPostcodeanywhereCoUk.ArrayForWayPoints|true|false 19:08:42.131 (131721554)|VARIABLE_ASSIGNMENT|[55]|WayPoints|{"apex_schema_type_inf (1 more) ...":"0x6e97fb34","field_order_type_inf (1 more) ...":"0x4085a95d","WayPoints_type_info":"0x329c23aa"}|0x1ed104d3 19:08:42.131 (131728081)|VARIABLE_SCOPE_BEGIN|[55]|DistanceType|String|false|false 19:08:42.131 (131734136)|VARIABLE_ASSIGNMENT|[55]|DistanceType|"Fastest" 19:08:42.131 (131739732)|STATEMENT_EXECUTE|[55] 19:08:42.131 (131742157)|STATEMENT_EXECUTE|[56] 19:08:42.131 (131945409)|HEAP_ALLOCATE|[56]|Bytes:52 19:08:42.131 (131962747)|CONSTRUCTOR_ENTRY|[56]|01p250000009btZ|<init>() 19:08:42.131 (131988854)|VARIABLE_SCOPE_BEGIN|[26]|this|ServicesPostcodeanywhereCoUk.DistancesAndDirections_Interactive_Distance_v1_00_element|true|false 19:08:42.132 (132111331)|VARIABLE_ASSIGNMENT|[26]|this|{}|0x60572028 19:08:42.132 (132123310)|VARIABLE_SCOPE_BEGIN|[2]|this|System.ApexBaseClass|true|false 19:08:42.132 (132142781)|VARIABLE_ASSIGNMENT|[2]|this|{}|0x60572028


Trigger.DistanceCalc: line 5, column 1 19:08:42.624 (624939087)|FATAL_ERROR|System.AsyncException: Future method cannot be called from a future or batch method: DistanceCalc.webServiceCal(Id)