SAP Note 25003 - Error total displayed as zero

Symptom:

If the tracking signal is exceeded, either by a standard forecast or an export forecast, this sets an exception message and the error total is reset to zero. For subsequent forecasts, the exception message is then no longer set first. For the case that the described situation occurs for the last (newest) historical value in the forecast, then you get the unpleasant side effect that the forecast error is displayed as zero although this can obviously not be the case. Therefore, in Release 3.0, the error total is no longer reset despite the reasons described above. If you also want this functionality in Releases 2.1 and 2.2, then carry out the following repair (modification !). If you would prefer the older variant in a 3.0 System then reverse the changes. In any case, the following routine can be found in Include LSPRGF00.

Cause and prerequisites
Solution
See the repairs in the program code.