eConnect error 203 - taRMTransaction

Cash Amount (CASHAMNT) > 0 but the Checkbook ID for the Cash Payment (CBKIDCSH) is missing.
This issue could occur if you’re trying to create a AR document (Invoice , Debit Memo) and on same time you are trying to collect the cash on fly (cash type =Cash) and you did not pass Checkbook ID , as per eConnect functionality user can collect the cash directly in the AR document (Invoice , Debit Memo) by providing the following details:
1. Cash Amount        
2. Cash Number                
3. Checkbook ID Cash                                                 
4. Cash Date
5. Document Number Cash         
Note: the all the above parameters are optional in the definition of the taRMTransaction method but if you provide value in the cash amount field all those fields will become as required parameters and user has to provide the proper values