Hi Rishab.
I'm not sure about future, because MATDOC-DMBTR still has 13 symbols.
I can share my thoughts:
1. acdoca very similar with faglflexa, and faglflexa-hsl also 23 symbols.
2. I remember oss message from customer with old system - before 6.0, and they had balance of account greate then 13 symbols, and it was an issue for GLT0 table. So I assume that 23 symbols very useful for this, especially for balance accounts.
3. acdoca and faglflexa could use splitting, and amount could change extrimly in splitted docs in contrast with bseg