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about absolute address variable using"_at_"

when I define a variable like next:
uchar idata M_TVar _at_ 0x80;
I got a warning:
*** WARNING L4: DATA SPACE MEMORY OVERLAP FROM: 0000H TO: 0001H

the next is in .M51 file:

* * * * * * * D A T A M E M O R Y * * * * * * * IDATA 0000H 0001H ABSOLUTE
* OVERLAP * IDATA 0000H 0001H ABSOLUTE
* OVERLAP * REG 0000H 0008H ABSOLUTE "REG BANK 0" DATA 0008H 0040H UNIT ?DT?MAIN

how i fix it?

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