Go to the "Financial > Purchase Credits" from the dropdown menu.

Find the specific purchase credit you want to add items to and then click on the credit to select it.

Once the credit is selected, click on the "New" button in the lower panel. (1) This action will add a new row for adding items to the purchase credit.

In the new row, enter the quantity, description, net cost per unit, VAT code, and Nominal code for the item you want to add. (2) You can use the keyboard to tab through these fields and fill them out more quickly.

After entering the item details, click on the "Save" icon on the right to save the changes and add the item to the purchase credit. (3)