Production planning dates problem and capacity dispatching

Dear All,

I face the following issue, i have one FG, SFG and a Raw material. For FG i have 4 operations with total lead time 1 hour ,SFG 1 operation with lead time 1 hour.

We follow MTO strategy-20 here, now when i run MRP and check the date and time of generated planned orders post MRP run, it is wrong. Obviously we have to do SFG first and then FG. But it generates date and time for FG first and then SFG later or both FG and SFG in same time and date. When i consulted with a senior he says it is generating planned order date and time based on planned order number sequentially.

Here we follow "Max lot size -1" for FG and SFG . BOM qty 1:1 ratio.

Example FG 2 sales order qty, then 4 planned orders got generated with 1 quantity.

FG planned orders - 0001,0002.

SFG planned orders - 0003,0004.

But dates got scheduled for FG and SFG wrongly. Then i tried dispatching using CM25 to correct them, but dates get scheduled for FG first and SFG later which is obviously wrong and the reason they say is because the planned order sequence is like that with FG first.

I searched in forum and there were few similar threads about same issue but with no replies for it.

Kindly guide me with this since this is a basic planning..