BEAst: Price Type Code (T6720). In Peppol "CT" is the only valid code, so it can be used only when the Price Type Code is "CT". Peppol: The code CT indicates that the item is offered in accordance to the referenced contract.

Namespace
cbc urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2
Data type
Code
udt:CodeType
Fixed value
CT
Business terms
tir110-094
Rules
Identifier/Error message Flag
PEPPOL-T110-B22601
Element 'cbc:ActionCode' MUST contain value 'CT'.
fatal