Use Period Factor - Field name REQ_COVER_TYPE - remove the tick

Hello,

Please help me to understand what/how is populating the field Use Period Factor (REQ_COVER_TYPE) in APO. We have DP and PPDS implemented in APO. In /SAPAPO/MAT1 all materials have set flag on Set Period Factor (sheet Lot Size). We never changed the master data on APO, everything is CIF-ed to APO.

Now we want to remove this flag for all materials. I tested MASS t-code the flag was removed.

Now  the questions are:

- how to be sure that this field will not be populated again for the existing materials;

- how to action for new materials? I supposed that this field will be populated as soon as the material will be CIF-ed to APO. How I can managed do not be populated?

Thank you for help,

Valentina