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How to use the symbol ?STACK in another file

In start.a51, there is defined a idata segment ?STACK.

?STACK  SEGMENT   IDATA

Now, in my asm file, I want to use the ?STACK to reset the SP,when using it directly as follows,

mov SP, #STACK-1

but there is an error: "error A45: UNDEFINED SYMBOL"

How can I do it, thanks.

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