Field help (PTOPIOFCT) 

This factor is a number of days to be applied so as to sort the requirements to be assigned. The factor is calculated as follows:

(Priority code -1) * Priority factor

The priority code is 1 for Normal, 2 for Urgent and 3 for Very urgent.

For instance:

Priority factor 10
SOF number 1 for the 06/25
SOF number 2 for the 06/30

Here, the request to be assigned in priority is the SOF number 2 for its fictive requirement date changes to 06/30 - 10 = 06/20.