Assign an identification number category to logical system &1

What causes this issue?

You have not assigned an <DS:DE.BP_IDTYPE>identification number category
</> to the <DS:DE.BP_TC_DTE_LOGSYS>logical system</> or to the
<DS:DE.BP_TC_DTE_MAP_TYPE>BP identification</> <LS>Identification Number
from "Additional Partner Numbers"</> selected.
You are required to enter an identification number category for the BP
identification <LS>Identification Number from "Additional Partner
Numbers"</>.

System Response

The system terminates saving.

How to fix this error?

Assign the corresponding identification number category for your
application to the logical system.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.