There is an occasion problem with Average cost zero on Sales or Issue transactions on Sage 100 v2019.3 through v2020.1
Sage has posted fixes on KB.
CI6000T for v. 2020.0, 2020.1
CI6001T for v. 2019.3-2019.4
Released in March 2nd
KB
108946
To identify the items updated, Sage attached an Inventory Detail Transaction Report modified to select Average Valuation Items where the Cost was $0.00.
Also a list of Steps to correct the cost on the items and the G/L costs posted..
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Lee Graham
Friendly Systems, Inc.
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