Difference Work Order Start Date Calculation between One World and JDE 9.2

Hi ,

Can some one reply on the major difference for calculating the Start date of the Work Order Start Date based on Lead Time Roll up . What was the earlier basis prior 8.10 when this change happened . Based on the current logic it uses the Lead Time Conversion factor (LTCV ) and the Work Order Quantity. After 8.10 the calculation uses

Work Order Start date = LTCV * WO qty + Queue Time ( F4102) / ( LTPU . F4102 / LTCV .F4102 ) + Set Up Time . F4102 / Work Hours per Day (Mfg Constants ) .

Can some body reply what was the start date calculation for prior 8.10 . The client was earlier using One world Xe and upgraded to 9.2 .