Generation - Usage adjustment

Is there any method to adjust the generation and usage by say up to 5% +/- to take up any errors – idea for future inclusion?
Reason i ask is my Efergy monitor is about 3% high on generation and about 2% low on usage compared to origin online — they are pretty close but would be good if could match up


Depending on how the data is uploaded, a rule can be used to adjust the power value received.