Hi LL2113
Unfortunately MYOB has had, and still has, lots of bugs in the Inventory module. MYOB recently finally acknowledged COGS was incorrectly calculated in a number of instances, contacting some of the affected client via email.
So what you are seeing is likely caused by one of those many bugs - the MYOB scripts only fix a small number of the problems.
There is not enough information provided in your screenshots to clearly identify cause. For example we cannot tell if there was any existing stock or value before the purchase was recorded. Nor can we tell if anyone manually adjusted the value of the stock, or if there were any reversals and or credit sales/purchases - these are known to cause issues.
When you sell, MYOB uses the current value of the stock divided by the current on hand count to work out the COGS per unit. Adjustments or transactions processed AFTER the sale, will not change the COGS calculated for the sale.
The only way to fix this yourself is to reverse the sale. Then check the current value and the on hand count. If these are incorrect, fix these using an Inventory Adjustment Journal. Then process the sale again.
You can find a number of Support articles on Inventory here.
Regards
Gavin
