Invalid Mapping on the Account ID after successful dataload

Summary:

Invalid mapping which shows the Profile as - (dash) after a successful dataload and despite data in the DLWB.

Content (please ensure you mask any confidential information):

Hello, I have successfully built a direct integration between ERP Cloud (GL Balances) and ARCS .

The DLWB has data and the dataload completes with all green checks but the Result is showing me and Invalid Mapping link.

When I click on this. The profile id has a value of - (dash).

This is because I inserted a source expression of constant ("-") for each source dimension. Also tried this with the target expression but the same result.