Williston Basin Interstate Pipeline Co.

Second Revised Volume No. 1

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Effective Date: 03/21/1999, Docket: RP99-230-000, Status: Effective

Second Revised Sheet No. 754 Second Revised Sheet No. 754 : Effective

Superseding: First Revised Sheet No. 754

ELECTRONIC DATA INTERCHANGE

TRADING PARTNER AGREEMENT (Continued)

2.3.3 If there has been proper receipt pursuant to Section 2. 1,

verification and successful decryption pursuant to Section 2.2, and

if the receiving party nevertheless fails to transmit a Functional

Acknowledgement, the sending party's records of the contents of the

Document shall control, unless the sending party has retransmitted

a Document pursuant to Section 2.3.7.

2.3.4 By mutual agreement, the parties may designate in the

Exhibit(s) a "Response Document" Transaction Set as a substitute for

or in addition to an ASC X12 Transaction Set 997. A Response

Document confirms that a Document has been received, and whether all

required portions of the Document are syntactically correct, and

contains data sent by the receiving party to the sending party in

response to the substantive content of the related Document.

2.3.5 If the Response Document indicates an error, neither party

shall rely on the Document or portion of the Document which is in

error, if known. The sending party shall attempt to correct the

errors and promptly retransmit the Document or applicable portion or

otherwise contact the receiving party. If the Response Document does

not indicate any error, the Response Document shall constitute

conclusive evidence a Document has been received in syntactically

correct form.

2.3.6 If the parties have mutually agreed to the use of a Response

Document, and if there has been proper receipt pursuant to Section 2.1,

verification and successful decryption pursuant to Section 2.2, and if

the receiving party nevertheless fails to transmit a Response Document,

the sending party's records of the contents of the Document shall

control unless the sending party has retransmitted a Document pursuant

to Section 2.3.7.

2.3.7 Retransmissions. If the sending party of a Document has not

received a corresponding Functional Acknowledgment or Response Document

within the time frame indicated in the Exhibit(s), the sending party

shall retransmit the Document and such Document shall be considered a

new transmission for purposes of Section 2.