Calculating correct version after publishing major version creates new draft version of document

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SharePoint

SharePoint2010

Hi,

I created a workflow to calculate the correct version of a document, taking into account that the documents we are putting onto Sharepoint already have a version number before transfer to Sharepoint. The workflow starts when a document is edited and Approval status = Approved (this will be true after an approval workflow runs that starts when a new major version is published.)

If this condition is met, the workflow calculated imported version + version and outputs to a variable calc3.

Then the workflow sets the variable "actual_version" to the value of calc3.

This sort of works, but when the workflow runs it creates a new draft version of the document, the calculated actual_version is associated with the draft version, not the published major version as I need it to be.

Is there anyway to stop the workflow from creating a new draft version?

Thanks

Kate.