Avoid duplicate batch (batch managment)

Question

dear all,
We are facing problem related to batch managment .we are using manual batch entry .we don't want to make duplicate entry of same batch (which have already assign to material) against any material.what is solution to avoid duplicate batch entry.
can u tell me the settings and any user exit in which we can avoid the duplicate batch.
regards

Answer 1

Hi hema,
               in our scenario user  manually enter  batch of raw material in MIGO when we do good recipte in MIGO againts purchase order we enter batch manually.but we need that a batch which has already assign to raw material can not be assign again .if user enter the previous batch then system gives a error that batch has already exist.
may be u know the prob