Validation rule that only allows selection of the first day of the (past/future) Pay period

Summary: Validation rule that only allows selection of the first day of the (past/future) Pay period based on the Pay calendar while doing the transaction like Transfer and Promote. The error message should only come when payroll/salary is changed.

Client: Nabors

Use Case: #19

Content (please ensure you mask any confidential information): Has anyone implemented such autocomplete rule? Any kind of help would be great. This use case is approved for salary object.