subtract number of minutes from Peak_BeginTime in OpenLab Report designer

Dear All,

I would like to automatically scale each chromatogram to only show the area where peaks are present.  I managed to modifiy the rear part of the chromatogram by the function "Peak_EndTime+3" (under Chromatogram Properties and Time Axis). However I couldn't mange to truncate the chromatogram in the front by e.g. giving the function "Peak_BeginTime-3". The chromatogram always ends up beginning at - in this case - "-3" minutes. What am I doing wrong? What would be the right synthax for subtracting a number from a function like "Peak_BeginTime" oder "Peak_RetentionTime" etc. I tried various forms of brackets etc....without success.

Thanks in advance for your help


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