Some Blocks can’t be modified using REFEDIT command or Edit Block In – place in AutoCAD
Causes:
Image reference is used at the root level of the block.
Solution:
To be able to edit this kind of block in-place, try one of the following:
- Place the images inside child blocks (sub-blocks) of the main, parent block. In this way, you can use REFEDIT on the parent block.
- Use Block Editor to modify the block.
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Resoure: https://www.autodesk.com/support/technical/article/caas/sfdcarticles/sfdcarticles/Some-Blocks-cannot-be-modified-using-REFEDIT-in-place-in-AutoCAD.html