Ship to segments

N1 segments are used to exchange entity identifiers. The identifiers are exchanged in the fourth element of an N1 segment (N104). The first element (N101) is a code that defines the type of entity that is being communicated. The primary identifier is the ship to location. This is often a vendor assigned shipto account number. This is exchanged in N104 with an N101 value of ST. This element is referenced as N1ST04 indicating the segment, qualifier, and element position.

An N1ST04 is required because it is used to cross-reference the company, vendor, and other identifiers.