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CAD tip CAD tip # 4000:

Question CAD 
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Q - question

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    67611×  

See also:
Tip 13156:Insert or update a specific block from another DWG drawing.
Tip 13000:Labels of dimensional parameter values in dynamic blocks (parameters->attributes)
Tip 12214:How to set bitmap transparency in an Inventor drawing.
Tip 12150:How to update a block while keeping its attribute position and rotation?
Tip 12105:Select the smallest DWG object - MinOf utility.

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