funny acting mask

[psuplat]

Hi.

I've got a textbox on form with input mask
\T\M\CL0\C\H000000LAA0000 which access is automatically redoing to "TMC"L0"CH"000000LAA0000

i've got 2 problems with this.

when i scan the number from a barcode:

1. the 4th characted should be any letter required - but it always puts in K

2. when i go to table inputed number is i.e. K9152456MUR0987, the "TMC" and "CH" aren't recorded in table, why?

somebody has any ideas what to do about this?

thanks