Field &-&: Do not specify integer constants in quotation marks

What causes this issue?

You defined a constant for an integer field in apostrophes.

System Response

You are no longer allowed to define integer constants in apostrophes.
During activation, the error is tolerated, but can cause errors in some
database systems when the view is created.

How to fix this error?

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.