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If you dump a template which contains Controls into a VPE Document, which already contains Controls, the TAB- and Group ID's you had assigned in dycodoc might conflict with Controls that already exist in the VPE Document.

VPE takes care of that and resolves conflicts in the following way:
It keeps track of the highest TAB ID as well as the highest Group ID currently used in the VPE Document. If a new tenplate is dumped into the document, VPE offsets each TAB- and Group ID of the template with the currently highest value that is in use.

Therefore TAB- and Group ID's might change, if you dump several templates into one and the same VPE Document.