From the SAP Business One Main Menu, you have chosen  Business Partners Business Partner Master Data .

In the Business Partner Master Data window, in the general area, in the dropdown list next to the Code field, you have selected Customer.

In the Business Partner Master Data window, on the Accounting tab, on the Tax subtab, next to the Tax Information field, you have chosen the (Browse) button.

In the Tax Information window, in the TIN No. field, you have specified the taxpayer identification number.

In the Business Partner Master Data window, on the Addresses tab, you have not defined a ship-to address.

In the Business Partner Master Data window, you have chosen the Add or Update button.