Creation of SubSystem Adjustment DLR Fails with Internal Server Error

Summary:

On creating a data load rule to import subsystem transaction adjustments, when we go to save the integration after defining dimension mappings, the save hangs indefinitely. When we close out and reopen and attempt to save, we get "Internal Server Error" message.

Content (please ensure you mask any confidential information):

We have defined a source as an on prem database and a target as Transactions Subsystem Adjustments. When we go to create a data load rule for these to import from the source, we get an internal server error. We have other integrations for Balance Explanations using the same methodology that work just fine. Please indicate where we may have messed up here. We have noted that if we switch our Target to a different Target, it will allow us to save the integration without error.