Process Order Quanity based on Component Quanitity

Hy,

In most cases the component qty. are depends on prodcution/process order quanity, but we have a scenario in which Order quanity is only decided on the basis of Active component's avalable qty of a single bacth which is based on its potency.

For example

1.0) If available stock of a single batch of a active ingredient is 5.5 Kg (Assay is 97.5%) then we can take process order quantity of 5000 Nos.

2.0) If available quanity of a second batch of a actuve ingredient is 3.1 kg and (Assay is 98%) then we can tak process order quanity of 2800 Nos.

Due this we can not set our lot size.For every single bacth of active ingredient we have to do manual calculation of a process order quantity.

So pls guide how we can map this scenario for both planing and process purpose.

Regards,

Dhaval