所有的出入库的TRANSACTION都会往这个表里面插入数据，每一笔数据是直接insert还是通过interface再insert进去的，如果是interface的话是哪些，想知道原理。

我也想知道，期待高手！

An example of this would explain the calculation better.  You have part/item
number 123 in subinventory "Finished Goods."  You do two receipts for this
part - 50 & 100 - for 150 total quantity of onhand.
At this point, you have two rows in MTL_ONHAND_QUANTITIES_DETAIL:
  Item 123 "Finished Goods" Receipt #1 50
  Item 123 "Finished Goods" Receipt #2 100
  Total 150
Now you receive a Sales Order for a total quantity of 75 and need to deplete
Inventory by this amount. You bring the Receipt #1 to zero, and the system deletes it (50), and still need to use 25 from Receipt #2.  So now, your data in MTL_ONHAND_QUANTITIES_DETAIL  looks like this:
  Item 123 "Finished Goods" Receipt #2 75

understanding,
thanks.