Different requirements for absence entitlements and payments in payroll on non-working days

Summary:

Conflict between absence entitlement and payment requirements.

Content (required):

I have the following requirement for a qualification absence plan (sickness):

• The entitlement usage should be based on working days only
• The non-working days are determined by the work schedule supplemented by calendar events
• The non-working days should be paid at the same payment factor as the preceding working day, but should not count towards the entitlement usage
• There is a rolling backwards period of one year

The obstacles I am facing:

• Using a calendar days UOM will achieve my payroll requirement but non-working days will be included in the entitlement usage