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HNT_NeoHNT_Neo 

Process Builder Formula Syntax - Define Criteria for this Action Group

I'm trying to create a formula in Process Builder's, Define Criteria for this Action Group, to create a new record in a custom object (DRET__c) when a checkbox on the Account = true and a text field on the Account is not blank and no record exists in the custom object (DRET__c) that is related to the Account object.

I tried the below formula syntax but I am receving an error of "The formula expression is invalid: Field ISBLANK does not exist. Check spelling.​"
  
AND ( ([Account].checkbox__c = True ) && ([Account].field__c <> ISBLANK ) && ([Account].Dret__c.Id = BLANKVALUE ) )


Any help on this is appreciated. Thanks!
@Karanraj@Karanraj
Try with below formula syntax with the proper API field name. 
AND (
[Account].checkbox__c = True,
ISNULL([Account].field__c),
ISNULL([Account].customobject.Id) 
)
HNT_NeoHNT_Neo
I receive an error of: The element has an invalid reference to "Account.DRET__c.Id".
sailee handesailee hande
I guess you can not reference child object through parent object.So you can try this using some apex class.
Rakesh51Rakesh51
Try this

AND ( [Account].checkbox__c = True, ISNULL([Account].field__c), ISNULL([Account].customobject) )