ABAP DEBUGGER: Search for an variable which is used

ABAP DEBUGGER: Search for an variable which is used

I have the following problem:
I want to avoid that one field of the copied row gets copied into the new
row. (ME51n) I thought that I could search somewhere in the debugger for
this fieldname.
Example:
first row has the matnr: 100-1-15
now i want to search in the debugger for the field MATNR. Is this
possible? ( I know this example doesn't make sense, but my field is not
used that often because it's an self-created field )
Or is there an user-exit especially for that?
Best regards
Mike