How do I create default department coding for GL accounts used in relation to a project?

Summary:

Currently, when a project code is selected on an employee's expense report for GL accounts 503216& 503256, the five digit department segment of our account coding is defaulting to the employee's home department rather than 30011, even if the home department is overwritten with the correct department of 30011 by the employee.

Under Manage Account Rules: Project Costing for our CU Department Rule, we think a rule in between the two existing rules in the screenshot might solve the problem, but we don't know how to write a rule that says:

"If the GL account is 503216 or 503256, then the department needs to be 30011."