internal standardization technique

I am creating a custom calculation to evaluate based on internal normalization(IN) technique as follows:

Where RF is response correction factor.

Peak_Area*Compound_ResponseCorrectionFactor*100/CurrentInjection.AllPeaks.Select(function(x) x.Peak_Area*Compound_ResponseCorrectionFactor).Sum

The formula is not working correctly it does not sum the area of main peak or it assumed “Compound_ResponseCorrectionFactor”as zero for the main peak.

Does anyone have idea how to resolve this.

Thanks a lot.

I am using OpenLab v2.5.

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