Problem with Scheduled Deviation of Time and Labour

Summary

The results of Schedule Deviation are always positive, but in some cases it is necessary to have a negative sign with the result.

Content

Good morning,

I need to solve the following problem.

In the attached file you can see better what I am going to explain.

Calculated Hours are the hours that the employee has work. Scheduled Hours are the hours planned. The difference between the two parties indicates whether the employee has worked that day more time or less time (Scheduled Deviation).

The problem is that in both cases the difference reult is positive. It must be placed with a negative sign if the hours are less than expected. By doing this, if another day the employee has worked more, it would be compensate. If not, all those hours of difference (Scheduled Deviation) seems like the employee has not done any of them.