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I have a model with data columns. So, in first attachment you can see the results. The first column is the line number and i use the function {Line}. Some students are showed continuously, show i use GetTag with the Id of each student, which exists in data source, and Processing Duplicates: merged with tag. So, i have the result of second attachment. The function {Line} has the same result for the second case, but i want the function {Line} to count merged rows, as the third attachment.

Hello,

You can add the Tag property for the Line text component and then set ProcessingDuplicates property by Tag value.

Thank you.

I have already used the tag property to merge rows and the property ProcessingDuplicate= BasedOnTagMerge
The row numbers are displayed by using the system variable {Line}
However it seems that the line numbers are not the merged ones.

Hello.

The Line variable shows the number of the line.
If you need to change the numbering, You could use the CountDistinctRunning() function of additional scripts in events.

Thank you.