Pointer to 2D array

On Keil C51 compiler using an already posted solution I get the following warning

Mail.c(256): warning C182: pointer to different objects

on "pointer = &tab1;"

int (*pointer)[100][280]; // pointer creation
pointer = &tab1; //assignation
(*pointer)[5][12] = 517; // use
int myint = (*pointer)[5][12]; // use

WHY?

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