Hi,
Using formula variable also you can achieve this, but what if there multiple GLACs returning same string. If you want to just display part of GLAC code, then it is okey.
e.g. 123456789
123456799
123456712
123456713
123456714
Formula variable aggregation may fail in that case.
If you add Nav Attr to 0GL_ACCOUNT it will give you all features like aggregation, available for drill down etc.
Let's say you added AGLACC as Nav Attri with 3 char length.
In the transformation assign SAKNR to it and use below formula.
LEFT( 3, RIGHT( 5, SAKNR ) )
Regards,
Sucheta