I upgraded an existing system from VFP 5 to VFP 7. While testing the upgraded system the user noticed a problem when updating record. It is hard to track because it deos not always happen and I cannot reproduce at all on my single user developement system.

This is a stock room inventory system.

They bring up a form that updates information about recieved orders. This updates records in the orders table about how many items where recieved. It is also suppose to update the qunatity on hand and quantity ordered records in the inventory table, i.e. if 5 items are recieved on hand quantity is increased by 5 and quantity ordered is decreased by 5. This works most of the time. Occationally it does not. What could be causing this problem. What should I be looking at.

reprosss setting, buffering in form, buffering in data enviroment, etc.

FWIW main form uses a private data environment and called forms use none (which I assume mean use the calling form's data environment).

Any suggestions appreciated.