I import an .inp file to do some changes on the main model (like edit sketch) but I see this error when I wanted to double click on parts sketch to edit.
When you import an inp file you normally get an orphan mesh rather than a sketched geometry. For this reason you cannot modify the meshed part. Check the abaqus documentation because I believe than recent versions of Abaqus 6.12 or 6.13 have an option to modify an orphan mesh.