Too many recipients found for message type SHPMNT in the ALE model

Hi;

We are trying to send message type SHPMNT to 2 external systems.

We’ve defined filter in BD56 & BD95 for shipment type (VTTK-SHTYP).

When using only one external system with filter on SHTYP, iDOC is created.

When adding the 2^nd message type (within same “sub” distribution model) and using filter on SHTYP, SAP issues the following error:

Message no. B1130

In the ALE distribution customer model several recipient systems for

IDOCs with message type SHPMNT and filter object type 'LIFNR' with value

'1156203' have been modeled from this system, but only one recipient

system is allowed.

Why and what tells SAP to look at LIFNR, as my filter is on SHTYP?

Thanks in advance.