To do this, you have to set the appropriate settings in the Read External ID field in the Program Parameters (Settings | Program | Administration Panel | Settings | Program Parameters | Items | General).
External IDs are usually used when entering lines in documents of receiving.
Example 1 - Entering an Item in the Items Register
You are purchasing an item that was assigned ID 1. Supplier & Sons, the supplier of this item, has its own ID and name for this item: that is, 34567. This ID is used only by Supplier & Sons.
First, set the appropriate setting in the Read External ID field – P – Use External IDs for Specific Subject or Subject type. This option is used when a specific subject or subject type’s external ID is entered in the Items register.
Open the Items register (Settings | Items | Items). In the External IDs panel of the Items register, enter the subject and its ID. Finally, supply name for the item.

When you enter a line in document of receiving, specify external ID listed in the supplier’s receiving slip:

Once you confirm the entry by pressing ENTER, ID that your company uses for the item is located automatically – this ID must be used to record the receipt of the item at your company’s warehouse.
