IDOC interface is not complete in MATMAS

Hi

I am new to ALE and trying to transfer material between two clients in the same BOX through MATMAS.

I am sending material through BD10 and IDOC is properly sent to receiving system. But on the receiving side I am getting the error message 51 whose reason is as follows

"The IDoc interface is not complete for message type MATMAS".

In the sending system receipients partner profile is maintained as follows.

Outbound partners grid

Message Type

MATMAS

SYNCH

Inbound partners

Message Type:- MATMAS (Process code is MATM),

Partner Func:- LS

Earlier I was getting the message "Function module not allowed: AFS_RETAIL_ARTMAS_IDOC_INPUT" but I have corrected the error by maintaining the correct FM assignment in WE57. (FM processing is set as "immediately triggered" in partner profile attributes)

Please advise me where I am wrong