Hi @Spunny ,
If the data contained in a cell has an error as far as Excel is concerned, and background error checking is switched on, then a small green triangle will be shown in the left hand top corner of a cell. If you were to click in the cell, a drop down list of solutions to the error will be offered. On some occasions, you may not want to amend the data in your cell, but you may want to hide the green triangle, thus ignoring the error. If you just want to ignore the little green triangles, check out: How to Get Rid of the Green Triangle in Excel.
Or you should check that the expressions in the report are correct, for example, to see if division with a denominator of 0 is handled properly, and if aggregate functions such as the sum function are used correctly.
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