Change a Material A from Planning at APO( XO ) to MRP (PD)

Hi,

if i change a material from planning at APO to R3, what is the impact that i need to prepare ?

do i need to delete the planned order at APO for the material and set the deletion flag for the material at APO or delete the material.

Do i need to set a C5 to delete the APO planned order at R/3?

Regards