MRP issue

Hi,

Our client gets a weird issue, they have a master planning batch job running every night. And for an item, AX will create a planned order on 1st of July. However if they run a dynamics plan for that particular item only, the planned order on 1st of July is gone, and create a new planned order on 1st of August.

Thanks,

The dynamic and master plans can have different settings. Anyway what is it pegged to?