Why does Fishbowl say "Cannot change part average cost in a"?

The system typically prevents changing a part's average cost when it's involved in a completed or posted transaction, where costs are locked for historical accuracy. Check whether the transaction or period is closed or complete.

Fishbowl: Cannot change part average cost

What it means

Fishbowl locks average costs automatically once transactions involving a part are posted or completed. The system calculates and maintains this value based on actual transaction history. You’re trying to manually edit an average cost in a state where the system won’t allow it.

What to check

Is the part involved in any posted or completed transactions (purchases, receipts, or inventory adjustments)?
Verify whether the relevant accounting period or fiscal window is closed or locked.
Check whether you should be recalculating average cost from actual transactions rather than editing it directly.
Confirm the part status—completed or archived parts typically have locked costs.