I need to make those fields required under 2 conditions. Record type and Subcategory (picklist).
I stated doing Validation rules, for the first one: Record type: Passport Subcategory: Renewal and New Issue Field required: Request Received from Location
RecordType.Id = "012U0000000a3kVIAQ" && ( ISPICK ( Subcategory__c , "Renewal") || ISPICK ( Subcategory__c , "New Issue") ) && ISBLANK ( Request_Received_from_Location__c)
I get a syntax error: Error: Field Subcategory__c is a picklist field. Picklist fields are only supported in certain functions.