I have similar problem. It generates planned production orders but not purchase orders for the components. I have nothing available on-hand. When I click explosion in the production order, generates nothing. I have checked the settings of the master plan, parameters, coverage group… Noting changed. Suggestions?
Can you tell us the supply -demand balance, the BOM settings and the coverage group settings for the component. Ensure the Stop Explosion is not ticked on the calculation group of the parent and component, and ensure the explosion time fence is sufficient. So many settings very difficult to pinpoint the trouble. Check your net requirements as well - why is the accumulation not negative, and check there is actually a quantity in the BOM or that there is an active BOM for the site.