Variable Decimal of Packed Type Variable: is this possible?

Hi Experts,
I'd like to ask if we can have a packed variable with the decimal declaration as variable also, like:
DATA p_pack_var TYPE p DECIMALS g_var_decimal.
The scenario is there is a field qamv-toleranzun which I want to be displayed like in the output in QP03. The display in QP03 has variable decimals according to the value in qamv-masseinhsw.
So for example: qamv-masseinhsw = 3 and qamv-toleranzun is a floating type value, the output in QP03 is format with 3 decimals.
Or if this is not possible, are there any approach to pass the value of the floating point variable to a decimal type variable with an indefinite decimal places.
Please Help. Points will be rewarded for valid answers.
Thanks!

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