...
Note. For tax invoice received with the Purchase or Other transaction type, the list on the tab is populated from the basis document and is not editable.
The "Tax Invoice Received (create)" form. The Inventory and Services tab
...
To add an inventory or service item to the list manually, click the Add button and select the item from the Items catalog master records or create a new one. To open the list of received inventory items and provided services, click in the Items column and then click Show all. To learn more about creating inventory and service items, refer to the Items topic.
You can specify the additional properties of the selected inventory item (such as size, color etc.) or service in the Characteristic column if the Enable Item Characteristics option is selected on the Administration > Settings: Purchasing and Warehouses form. Also, you can specify the batch (lot) number for items in the Batch column if the Enable batches option is selected on the same form. To learn more about the item settings, see Settings: Purchasing and Warehouses.
In the Quantity column, you can specify the item or service quantity. In the Unit column, you can select an UOM for the item if the Multiple UOMs per Item option is selected on the Administration > Settings: Purchasing and Warehouses form.
The Price column is filled in automatically from the appropriate supplier price list if such price is available (see Supplier Price Lists). If the contract is not in the national currency, the Currency and Price (CurrCur.) columns are also available. You can enter the prices manually by copying them from the supplier tax invoice.
...