Hi Mauricio,

I tried a test with Adagio Inventory (80B-2006.11.02) and Adagio OrderEntry (80A-2006.08.25) where I created an item that uses Standard Costing method and both Most Recent Cost and Standard Cost as 5.20. Base Price is 10.00 and made sure that the item is allowed at all locations.

I started by creating an order/invoice for qty 2300 in OrderEntry and posted and ran Day End. I then created a receipt in IC for the same location and qty 2300. At this point, all quantities and costs were 0.00 when inquiring on this item. I then created and posted and Day Ended a 2nd order/invoice for the same item and qty 2300. OE Day End did not calculate any cost variance as expected because the Most Recent Cost and Standard Cost were both still equal at 5.20. The amounts updating the IC Control Account and Cost of Sale account were both the same as well.

So I was unable to re-create the problem you reported with the versions of IC and OE I mentioned (which happen to be both one release after what you are using). Assuming that the costs you posted are coming from the IC Transaction history report, this means that you have printed and purged the Invoice Audit List report in OE - so we can't check there to see what information is recorded there. If you have a printed hard-copy of the OE Invoice Audit List, perhaps check to see what cost values are there.
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You mentioned at the beginning that you entered orders with Adagio OE but invoiced with Accpac Plus OE. How do you do Day End Processing? This is key as Day End is what determines the costs for IC items.
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On your posted information, I see that the Cost of Goods GL account was different. Did you change this information (either the item's Category code, or the GL account on the Category code) between the Day Ending of the first and second OE invoice? It was account 5532 and now it is 5005.

Also, the amount going to your Inventory Control GL account 1205 is significantly different (27,496,000) than what it was the first time (-11,960.00). I think this is the key to determining the issue, rather than this being a Cost Variance problem (which is likely correctly calculating a difference but just between two values that shouldn't be different).

It is Day End in OrderEntry that is determining the costs. Wherever you are doing Day End (either with Adagio or Accpac Plus) then I believe this is the cause of the problem.