IDOC_INPUT_SPE_DELVRY: RMA numbers could not be found

HI,

I am new to IDOC, In WE19, I'm using the function module IDOC_INPUT_SPE_DELVRY(For IBD creation). While executing the function module I am getting the error "Delivery Items with requested RMA numbers could not be found".  In we02, I'm searching the BASIC TYPE is DELVRY05 but there is no idoc.

Thanks with Regards,

Vallamuthu M