Per the Development Team, the main rule of this editor is: The AFE is unable to do reverse engineering i.e. to reflect changes, which are made in the function body, on the grid. This is not trivial task and in general case - not doable. If changes on one of field values in the input’s record for example then the only way to do that is to change it in the grid.
The two rules should be used here are:
1. The AFE cannot be used for reverse engineering, i.e. to reflect changes, which are made in the function body, on the grid. Therefore, change the values in the grid only.
2. When changes in the grid are made, the assignment function is regenerated and all the manual changes are lost. So it is better to make needed changes in assignment functions when the test definition is in stable status.