How to dynamic for declaration variable?

This is my problems
I will by PLMK-STELLEN data to determine decimals
Example:
IF PLMK-STELLEN = 3
then data: l_amt1 type p decimals 3.
IF PLMK-STELLEN = 2
then data: l_amt1 type p decimals 2.
For this case, how can i do, please help.
Thanks a lot!!

You should use dynamic declaration.
TYPES:
p3 TYPE p DECIMALS 3,
p2 TYPE p DECIMALS 2.
DATA dref TYPE REF TO data.
FIELD-SYMBOLS <l_amt1> TYPE ANY.
IF PLMK-STELLEN = 3
CREATE DATA dref TYPE p3.
ELSEif IF PLMK-STELLEN = 2.
CREATE DATA dref TYPE p2.
ENDIF.
ASSIGN dref TO <l_amt1>.
Hope it helps.

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