Diagnosis
As a result of the stock postings you want to make, the inspection lothas been credited so much that the quantity &v1& &v2& left for postingis less than the planned sample size.
Since the inspection has not yet been completed (the usage decision hasnot been made, nor has the inspection completion been set), this couldlead to no sample quantity being available for the inspection.

Procedure
Disregard the warning, after checking your entries, by selecting ENTERor correct the value you entered.