Batch query !

hi all

I have a problem with batch determination.

When I process my out bound delivery delievery document (VL01n) the batch number for the shipment is not getting determined. When I press F4 for the possible values it says, "invalid batch determined" but allowing me to process the delivery and PGI.

Why so? Can any one clarify please.....

In the meantime, if any of you have a complete document (with screen shots, if possible) on batch determination procedure please send it to me at givebest@gmail.com.

Thanks in advance !