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CAD tip CAD tip # 4000:

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Message: Duplicate definition of block XXXXX ignored

A - answer AutoCAD displays this warning if you try to insert a block (or a drawing containing a block) with the same name as one of the blocks defined in the current drawing. AutoCAD warns that it will use the existing (old) definition of the block.

If you want to redefine (overwrite) the existing definition of a block in your drawing, use the -INSERT (_-INSERT) command as:

_-INSERT oldblockname=newblockname  
and cancel (interrupt) the command right after the first prompt with the ESC key. With this, you will overwrite the old block definition with the new contents from the external file newblockname.DWG
100% *  CAD 
3.9.2004    54428x  
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See also:
Tip 11198:Justified attribute text in mirrored blocks (AutoCAD)
Tip 10574:Four methods for exploding blocks in AutoCAD.
Tip 10173:How to insert a block from another DWG file?
Tip 9870:Xref NAME has multiple references. Not detached.
Tip 9711:3DConstruct - converting a 3D mesh to a frame construct

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