Fixing of Production Orders Dates

We are utilizing strategy group 82, where production orders are created directly

at the event sales order creation. Any changes to the delivery dates of the sales order

is effecting production order dates.

Would like to prevent automatic update of basic production order dates, if

sales orders delivery dates are changed (or) when Read PP master data is executed (unless manually

production order dates are changed by a production scheduler)

We tried the following setting in OPU3 "3 Do not adjust basic dates,dept. reqts to order start" for

the given order type but to no avail

Any suggestions