Shift pattern in Resource - 14 day shift mapping

Hello Gurus,

Shift pattern - 14 day shift

I would like to add a 14 day shift pattern into the resource within SAP.

The "length of the cycle" would be 14 days, however the system displays

an error message stating that only 1 or 7 days is valid.

The actual working days would be Monday, Tuesday, Wednesday, Thursday,

Friday, then Monday, Tuesday, Wednesday, and Thursday ( 9 days working

out of a possible 14 days)

How to get it done?

and Can the cycle length be changed to allow 14 days? then this problem can be tackeled.

Thanks in Advance,

Sap User