In the Company Details window, on the Basic Initialization tab, you have selected the Permit More than One Document Type per Series checkbox.
From the SAP Business One Main Menu, choose
.In the Relate Series to Document - Setup window, double-click the row of the master data or document to which you want to assign numbering series.
In the Series - <Document> window, select the corresponding checkbox of each numbering series that you want to assign to the master data or document.
Choose Update and OK.
Note
After assigning the required numbering series to the master data or document, you can define a series as the default for certain users. However, when a related numbering series has been defined as the default, you cannot cancel its assignment to the master data or document. For more information, see Setting Default Series.
In the Relate Series to Document - Setup window, choose Update.