Mod #1089 Market Cost set to Average of Real Cost

Changes the operation of the Cost/Price Update process in Receiving so that Market Cost is recalculated as an average of Real Cost regardless of the update method (Average or New) chosen to update the actual Real Cost value.

 

The point of this modification was to produce a running average cost regardless of how the working Real Cost value was being updated so the value which should have been used in calculating the updated Market Cost value was the received cost of the item.