The available quantity in products specifies the initial quantity of products in the warehouse. By selling a given product through issuing a sales invoice, the quantity of that product will decrease accordingly.

NOTE: This field can only be filled in if we do not have the Warehouse module enabled (if we enable the warehouse, then to increase the quantity of products, we need to issue a document to receive them into the warehouse, e.g., AG). Additionally, if we enable the warehouse module, for all products that have manually filled initial quantities, appropriate warehouse documents will be automatically generated.