DoD activities are encouraged to transition as soon as possible in FY16 to this new method for numbering orders under DoD contracts and agreements. Transition must be completed no later than October 1, 2016.) C - DoD Procurement Instrument Modification Identifier (Supplementary PIID)
http://www.acq.osd.mil/dpap/dars/pgi/pgi_htm/current/PGI204_16.htm
For example, an agency may use as its PIID for an amended solicitation, the Government-unique identifier for a solicitation number (e.g., N0002309R0009) in conjunction with a non-unique amendment number (e.g., 001). The non-unique amendment number represents the supplementary PIID.
https://www.federalregister.gov/documents/2010/08/17/2010-20282/federal-acquisition-regulation-unique-procurement-instrument-identifiers-piid
FAR 4.605 requires agenci es to have a process in place that. ensures each PIID reported to the Federal Procurement Data System (FPDS) is. distinctive and remains so for at least 20 years from the date of contract award. Departmental compliance with this regulatory requirement was achieved with the. issuance of the VA PPM 2012-04, Unique Procurement Instrument Identifier (PIID.
https://www.va.gov/oal/docs/business/pps/memoUniqueProcurementInstrumentIdentifier.pdf
The first 13 digits of the contract number. A number used in conjunction with the basic PIIN to identify the contract. This number is referred to as the call/order, or delivery order, under a Blanket Purchase Agreement (BPA), Basic Ordering Agreement (BOA), or Indefinite Delivery-Type (IDT) contract. This entry represents the BOA/IDT if order is PIID compliant i.e. 13 digit with F in 9th position of the PIIN.
https://www.sdw.dcma.mil/ORDERS_PIID.HTM
For example, an agency may use as its PIID for an amended solicitation, the Government-unique identifier for a solicitation number (e.g., N0002309R0009) in conjunction with a non-unique amendment number (e.g., 0001). The non-unique amendment number represents the supplementary PIID.
https://www.acquisition.gov/far/html/Subpart%204_1.html
Supplies and services already acquired under this contract number shall remain solely under this contract number for purposes of Government inspection, acceptance, payment, and closeout. All future [delivery orders] [task orders] [options exercised] will be accomplished under continued contract [insert contract number].
http://www.acq.osd.mil/dpap/dars/pgi/pgi_htm/current/PGI204_16.htm
Components are encouraged to transition to the Procurement Instrument Identifier (PIID) numbering schema as soon as possible, but no later than the date specified at DFARS 204.1601(b).  (c)(i) A continued contract is issued solely for administrative reasons.
http://www.acq.osd.mil/dpap/dars/pgi/pgi_htm/current/PGI204_16.htm
4.1600 Scope of subpart. This subpart prescribes policies and procedures for assigning unique Procurement Instrument Identifiers (PIID) for each solicitation, contract, agreement, or order and related procurement instrument.
https://www.acquisition.gov/sites/default/files/current/far/html/Subpart%204_16.html
(a) Identifying the PIID in solicitation and contract award documentation (including forms and electronic generated formats). Agencies shall include all PIIDs for all related procurement actions as identified in paragraphs (a)(1) through (a)(5) of this section. (1) Solicitation.
https://www.acquisition.gov/sites/default/files/current/far/html/Subpart%204_16.html
The contracting officer normally signs the contract after it has been signed by the contractor. The contracting officer shall ensure that the signer(s) have authority to bind the contractor (see specific requirements in 4.102 of this subpart).
https://www.acquisition.gov/far/html/Subpart%204_1.html
contract number piid
The contract number of Procurement Instrument Identifier is a number used in conjunction with the basic Procurement Instrument Identification Number to identify the contract. 