Why use field glcode in purchdetails table?

[PakRicard]

Hi all:

Why are we using the field glcode in table purchdetails when receiving goods to assign the value of goods received into the stock GL account, instead of using the stock GL code of the inventory category of the item?

I found out that some items had the stock value wrongly assigned when receiving. It turns out that some items change their inventory category during its lifetime so, they had a category A with GLcode GLA, then (for business reasons) category changed to B with GLCode GLB before reception.
At reception time, stock gets assigned to the old category GLA account.

The code is quite clear and there must be an accounting reason for this, but I can't find it. Why couldn't we use directly the GL assigned to the stock category of the item?



P.S.: We use stockcategory to control cycle of life of the items, having stock categories: test, stable, discounted, etc... so all the items pass though some stock categories during its life.