RP refering to previous row issue

Need help
1

Hi Bubblers! I have the following problem with referring to the previous row of my RP

Zrzut ekranu (181)
Zrzut ekranu (181)1261×940 138 KB

As we see in the picture there are three rows of my repeating group
Each row has a number that must be added or subtracted from the row balance (A,B,C,D)
The Ballance of the row is a dynamic value that depends on the previous row balance + subtracted/added amount of the current row
The question is HOW TO REFER TO PREVIOUS ROW BALLANCE if I don’t store this value in the database

2

Use a hidden group. Refer to current types item# current cell index minus 1. This will let you read the previous value.

3

Ballance of the row is not stored in database, so I can’t refer to it by row index ,

4

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