Dimension for Customers

In Sales & Receivables Setup page the field Autom. Insert Customer Dimension Value controls whether the Customer No. is automatically created as a new dimension value for each new customer. This is then automatically assigned to the respective customer. Dimensions are usually used for evaluation purposes and are passed on from the master record (here: customer) to the associated transaction data. For details on how dimensions work, please refer to this part of the Microsoft documentation. The default value for this setting is YES.