It’s a common use case to chart two sets of data against a time series, ie budget vs actual, receivables vs payable etc. Frappe Charts via config can only do one data series but I know the separate/underlying charts module can do multiple. Suggestions on cost and who could dev this feature for me and submit as pull request?
good feature request.
You should be able to do this already. I haven’t played with it much, but as of v13.0 Dashboard Charts can take any report as input. With this, you can use existing reports or create a new script report crosstabulating data from any number of tables.