Why is the inventory not affected by sales and purchase invoices?

There are two ways to handle inventory outbound and inbound.

The first: is the direct method, where inventory is issued and added as soon as this action is taken in the system.

The second: activating requisitions. This means that when adding or issuing products, inventory will not be affected

until the requisition is approved by the responsible person.

So, if you find that the inventory is not affected by purchase or sales invoices, the reason may be due to the activation of requisition in the inventory settings. You need to approve the requisition to add or issue products or disable the requisition feature if it is not needed.