err in we05

Hi,

i am doing idoc(R3) >xi (R3) scenario,

after thru wth all the config, i m getting an error in the receiver system(in my case it is the same r3 system which is also a sender) in we05 transaction that

""Application document not posted"",err in fumctn module"IDOC_INPUT_MATMAS01"'

all the ale config is ok..

process code i selected is "matm" while setting the inbound idoc(matmas02),

why this error..not able to sort out..

can anyone help!!