Appendix B. X12 Control and Guidance

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B.1 X12 Control and Guidance

B.1.1 Referenced and Related Standards

This technical report is based on the X12 EDI standard which comprises a series of interdependent publications. Implementers are advised to consult these publications when using this technical report.

The following standards are required to interpret, understand, and use this technical report:

  • X12.5 - Interchange Control Structure

  • X12.6 - Application Control Structure

The following guideline is useful to interpret, understand, and use this technical report:

  • Compliance in X12

The following reference model is useful to interpret, understand, and use this technical report:

  • Acknowledgment Reference Model

All of the documents above are available online using links to X12's Online Viewer.

B.1.1.1 Transmission Control Schematic

Refer to X12.5 - Interchange Control Structures, Section 3.5 - Order of Control Segments, and Chapter 5 Interchange Segment Specifications.

Similar transaction sets, called "functional groups," can be sent together within a transmission. Each functional group is prefaced by a group start segment; and a functional group is terminated by a group end segment. One or more functional groups are prefaced by an interchange header and followed by an interchange trailer. Figure B.1 - Transmission Control Schematic, illustrates this interchange control.

Figure B.1 - Transmission Control Schematic

Transmission Control Schematic


B.1.1.2 Constraints applicable to the suite of TR3s

Refer to X12.6 - Application Control Structure, Section 3.2.8 - Minimums/Maximums.

Data element minimum and maximum lengths are set by the ASC X12 standard. This implementation guide may further restrict minimum and maximum lengths within the bounds set by the standard. Such restrictions may occur implicitly by virtue of the allowed qualifier for the data element, or they may be stated explicitly in a note attached to the element or in the general limitations below.

B.1.1.2.1 Maximum Length of Data Element 127 Reference Identification

The current ASC X12 standard allows a maximum length greater than 50 characters for data element 127. For implementations governed by this implementation guide, unless another value is specified in an attached note, the maximum length of each occurrence of this data element is constrained to 50 characters.

B.1.1.2.2 Maximum Length of Data Element 782 Monetary Amount

For implementations governed by this implementation guide, unless another value is specified for an instance of Data Element 782 within Section 2 (Transaction Set), each occurrence of Data Element 782 (Monetary Amount) will be limited to a maximum length of 10 characters including reported or implied places for cents (implied value of 00 after the decimal point). Note that the decimal point and leading sign, if sent, are not part of the character count.

EXAMPLE

  • The following transmitted value represents the largest positive dollar amount that can be sent: 99999999.99

  • The following transmitted value is the longest string of characters that can be sent representing whole dollars. 99999999

  • The following transmitted value is the longest string of characters that can be sent representing negative dollars and cents. -99999999.99

  • The following transmitted value is the longest string of characters that can be sent representing negative whole dollars. -99999999

B.1.1.3 Decimal

While the ASC X12 standard supports usage of exponential notation, this guide prohibits that usage.