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This is an example of an Invoice. On this Invoice, we use a UNIT to display the Line Items on the Invoice, and the Unit call is based on the DATA ITERATION method.

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Our example is based on a Retail Invoice Report.

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Here we see the Tag in the main Document that calls the Unit.

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This is the name of the Unit to call, and it can be selected from the lookup.

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This type of Unit is always based on a listed Direct Data Source single record, for this Report.

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And we select the Field Number that the system will count in the data record, to determine how many iterative lines there are present.

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The Help explains the 2 primary types of Unit Call, and that the Iteration method which we are using here, is based on the counting of a selected Field number in the data record.

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Here we can see the Data Source listed.

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From the Metadata, we can retrieve the Data Source Layout.

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Our Iteration Field for this Unit Call is Field number 1, where DocWriter will count how many lines are present, with correlated iteration Values on the other indicated multi-value Fields.

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This Template is ALWAYS used with a Data Source Record where the Unit is based on an included Data Set where a number of Fields have correlated multi or iterative Values.