(c) Limitations. An International Agreement Competitive Restrictions (IACR) must be used when the terms of the document referred to in DFARS 206.302-4(c) have the effect of requiring the use of other than competitive procedures, even if the agreement, treaty, or written direction does not specifically name a particular source or sources. The contracting officer is authorized to prepare the IACR (see MP5301.601 (a)(i) Head of the Contracting Activity (HCA) Matrix). The contracting officer must include the IACR and a copy of the associated Letter of Offer and Acceptance, once completed, in the contract file.