Inbound Idoc status 56

I am processing an inbound idoc file using RSEINB00. It is creating an idoc in status 56. I am not able to figure what is wrong. Please suggest. Here is the error.

EDI: Receiver port in control record is invalid

Message no. EA602

Diagnosis

An error was identified in the control record while adding an inbound IDoc. The recipient ID is invalid:

The receiver port has an invalid value: ZCLR

Procedure

Please inform your system administrator.

Thanks,

Lavanya