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Here is a detailed response to address each of the sender’s queries:

Subject: RE: Clarification on CUSDEC and CUSRES EDI Formats

Dear [Sender’s Name],

Thank you for reaching out. Below are the clarifications for your queries regarding the CUSDEC and CUSRES EDI formats:
	1.	Difference between separators used in the EDI document:
	•	The colon (:) is typically used as a component element separator within a composite data element.
	•	The plus (+) serves as the data element separator, which means it separates different data elements in a segment.
	•	The single quote (’) is used as a segment terminator, indicating the end of a segment.
	•	These separators are defined in the UNA (Service String Advice) segment at the beginning of the file, which specifies how to interpret delimiters in the message. If UNA is not explicitly mentioned in your document, the default UN/EDIFACT separators apply.
	2.	Compulsory file header/footer elements:
	•	In EDIFACT-based messages like CUSDEC and CUSRES, the UNA segment is optional but often included to explicitly define delimiters.
	•	The UNB (Interchange Header) is mandatory as it identifies the sender, receiver, and other control information.
	•	The UNZ (Interchange Trailer) serves as the footer, closing the interchange.
	•	Other control segments like UNG/UNE (Functional Group Header/Trailer) and UNH/UNT (Message Header/Trailer) may be present depending on the structure.
	•	If you are unable to find UNA in the reference PDF, the file might be using default delimiters set by the EDIFACT standard.
	3.	Interpretation of reference PDF for EDI elements (Ref, Tag, and Code):
	•	Ref (Reference number) refers to the unique identifier assigned to a segment or a data element in the EDI standard.
	•	Tag represents the segment identifier (e.g., UNB, UNH, etc.), which is crucial for defining the segment’s purpose in the message.
	•	Element Name describes the specific function of a data element in that segment.
	•	In your example, UNB010 is likely referring to a sub-element of the UNB segment, S001 is the composite element that contains multiple values, and SYNTAX IDENTIFI (likely SYNTAX IDENTIFIER) defines the syntax version of the message.
	4.	Interpretation of position reference in the Excel file:
	•	If the Excel file contains mappings or position references, they typically align with the segment structure and positional hierarchy within the EDI file.
	•	Each row in the Excel sheet may represent a segment or a data element, specifying its order and mapping logic.
	•	It would be helpful to check whether the Excel file follows a standard EDI mapping format, where positions correspond to element indices in a segment.

Let me know if you need further clarification.

Best regards,
[Your Name]
[Your Position]
[Your Company]

This response ensures clarity, provides technical depth, and maintains a professional tone. Let me know if you’d like any modifications.
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