To reproduce the bug: 1\. Place parts U1\.1 and subpart U1\.2\, \.\.\. on schematic Sheet 1\. 2\. Create sheet 2\. 3\. Cut U1\.2 from sheet1 and paste it into sheet 2\. 4\. On sheet 2 a component U2\.2 exists now\. Expected: U1\.2 instead of U2\.2 \. Drag and Drop did not work\, too\. Workaround: Rename U2.2 to U1.2.