Edit module prestashop 1.7.*

We have a module for prestashop 1.7.* this is a module to synchronize the stock of the stores. In our case we need to have the same stock of products in all stores, add or subtract should always be the same. The module that we have acquired in theory works when there are two stores with different databases.

But we have a store with a multistore and we need it to work with the stores of the multistore, which share the same products and the same reference numbers per product. In this case the module does not work well in the multistore, that is, the inventory is not updated.

We need to correct the problem of the module so that it can work.