Unable to convert sender service XXX to an ALE logical system

Hi,

I have two business services that need to use the same logical system (idoc adapter). But in Integration Directory --> Business Service --> Adapter-Specific Identifiers it will only let me use the logical system in one of the business services.

If I try to set it in both I receive the message "Logical system XXX already exists in service XXX"

When triggering idocs I get the error Unable to convert sender service XXX to an ALE logical system. IDOC_ADAPTER ATTRIBUTE_INV_SND_SERV

(for the business service where I could not specify the logical system in Adapter Specific Identitiers).

Is there a workaround

Thank you

Olof