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LoveLaceLoveLace 

arithmetic expression must use numeric argument

Hello guys,

This error is driving me crasy
arithmetic expression must use numeric argument

obj.Without_credit_time_off_amount__c =( (User.Salary__c)/30)*obj.Days__c;

Without_credit_time_off_amount__c currency type
Days__c formula field, number type
Salary__c is a currency type

I've tried to cast the salary__c value but in vain
Maf_007Maf_007
Your problem is User.Salary__c. In order to fetch that field you have to use UserInfo.getUserid().field Name.

Hope this helps.