Hello
It seems that you are running a reorder point MRP type, which means that the MRP type customizing (OMDQ) determines if MRP will consider external requirements or not.
On the MRP type customizing, you can choose if the external requirements will be considered or not and you can also choose exactly which ones will be considered by MRP. Unfortunately, you can only choose to consider stock transfer requisitions releases or stock transfer order releases, but not releases of stock transfer planned orders.
BR
Caetano