Absolutely correct!! I'll go with Anand as Inspection type activation is the criteria for inspection lot generation, not the plan assignment.
And this error message 'Origin not found' doesn't seem a standard one to me. I believe it is custom message which appears when BDC doesn't find an inspection lot, again the same case mentioned above.
Multiple plans will only result in lots with created status and probably your BDC does the rest work to assign them an inspection plan of your choice. CRTD lots will not appear in QA03.
Try QA32/33 and look for inspection lots and their system status. If they are there with CRTD, try assigning the plans manually. If you succeed in doing that, recheck the BDC or the upload file.
ntn