Error : ERR_* = . ..

- StepByStep (
               - Debit   <
                           CID : Sender
                           Sum : Amount
                         >,
                 Credit  <
                           CID : Receiver
                           Sum : Amount
                         >,
                 Journal < 
                           Opcode : JR_TRANSFER
                           CID_1  : Sender
                           CID_2  : Receiver
                           Amount : _     
                         >
             )
+ Ec, Error <>
  Log Error; Handle Ec
  ^/Error = Ec
;

If !Error then
 ...
Else
 ...
;