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The source attribute was added to the Euwe release of ManageIQ which replaces the old system attribute in the miq_ae_namespace table. Kevin Morey maintains different branches of his Automate model for different versions. His master was updated last weekend and was built with the CFME 4.2 exporter, which has the source attribute. You can't take his master branch which is only for CFME 4.2 and import it into previous versions of the product like CFME 4.1 Please use the correct branch when testing this. I have attached a screen shot which shows the different branches that shows the different branches. Please close this issue once you have verified this with the correct version.
Created attachment 1222470 [details] Screen shot of different branches
I spoke to Kevin he is going to be updating his master to remove the source attribute. So if you go looking for it now it might work. But the crux of the issue is still you can't use new data on older versions