APO planned order gets date-fixed when changed in ECC

[Former Member]

Hello Experts,

In our APO system, many planned orders get status "date fixed" automatically , when we change order in ECC.

We observed this when order is scheduled over weekend or when resource capacity is not available.

If we change planned order in APO ( Quantity or dates ) , then it doesnt get "date fixed", even if scheduled on weekends.

Please suggest what could be the reason.

Thanks.