How to define a bit variable at a specific bit location?

Hi,

I'm trying to define a bit variable at a specific bit location.

I tried the following without succes:

       BSEG AT 02FH.7
MYBIT: DBIT 1

The linker complains with
*** ERROR L107: ADDRESS SPACE OVERFLOW
SPACE: BIT
SEGMENT: ?BI??TEST?1
LENGTH: 000000H.1

The following works but the linker is assigning the address (and that is not what I want):

TEST_BIT SEGMENT BIT
       RSEG TEST_BIT
MYBIT: DBIT 1

Or I could assign the whole byte and then target the bit that I want (but then I have 7 unused bits):

       DSEG AT 02FH
MYBIT8: DS 1
sbit MYBIT=MYBIT8^7;

Shouldn't the first version work?

Geert