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When saving a Test Case or a Test Result, I get an exception with the code 01-2426

The error says "Format Error: the specified format is invalid. (01-2426)".

This occurs in the Aligned Elements Windows Client. 

This effect has to do with tables used (also called nested tables) in cells in the Table Attribute.

There is a known issue when the right edge of a nested table “touches” the column separator as in the image below.

 Table_With_Problems.png

How to solve it

You avoid this by increasing the width of the Object form (by maximizing the Aligned Elements application GUI or use a large monitor or collapsing the Project Explorer or making the Project Explorer narrower etc.) or making the table narrower.