Rescheduling of sale order

We have following scenario in scheduling of sale order

1. When sale order is created for the first time , it runs the avl check & the Goods Issue date is determined based on the cAvl control paremeters set in OVZ9 . At that point of time , we don't have any stock & planned receipts .Hence order gets scheduled based on TRLT set in material master

2. When a planned receipt is created later in system , its date is generally scheduled beyond TRLT of the material .e.g. TRLT of material is 7 days & the planned receipt may be expected to arrive adter 21 days

3. In such cases , we have to change the Goods Issue date in sale order by running the avl check again .

Problem : When we run the avl check in sale order again , it takes the TRLT into account & doesn't change the date as per planned receipt date , which is a more confirmed element than TRLT

How we can achieve this