Field help (SYNITV) 

Select this check box to recalculate the site stock based on the stock lines of this site.

The processing compares the file of product-site totals (ITMMVT) to the other files:

In the first instance, the system deletes the old amounts (storing the old values). After comparing the files described above, the ITMMVT file is updated when a variance has been established. This leads to updating all stocks (reserved stock, allocated stock, stock in transfer...) in the ITMMVT table.