How to increase length of domain ‘SETVAL’ from char24->char40?

Hi, experts.
How to increase length of ‘SETVAL’ domain char24->char40?
It’s used to convert material to LMN at SAP generated t-codes like ‘S_ALR….’.
U can find it at RGSMH-MIN, RGSMH-MAX.
Can’t find any note how to do it.

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