Idoc gets status 20 after status 03

I'm using an RFC transaccional port in R/3 , i am sending the idoc of bonus buy (WPDBBY), i send the idoc using the transacion WPMA, after that in transaction WE02 i see that the idoc has the status 20, but before this status the idoc got the status 03 (IDoc sent to R/3 System or external program)...

The idoc WPDBBY is correctly processed in XI..

¿Why i'm getting the error in status 20?