Hello
This issue is very weird and here are some suggestions for you:
1 - Make sure that note 1724458 is implemented;
2 - If this an assembly order, the deletion flag cannot be set by this program.
3 - Try again setting only the deletion flag.
If still the order is not selected, you can run directly the report PPARCHP1 directly on SE38 and set a break point on the following line:
PERFORM orders_select USING con_ordertype_porder.
In this form the orders will be selected and here you will find why they are not selected.
BR
Caetano