Indicates the type of of the document that is being referenced. Code MUST be used as follows: "130" to indicate aninvoice object reference, Code "50" for project reference, Code "sgdtotal-excl-gst" to indicate Invoice total with out GST in SGD, and code "sgdtotal-incl-gst" to indicate Invoice total with GST in SGD. Element is not used for other additional documents.

Namespace
cbc urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2
Data type
Code
Example value
130
Business terms
BT-18