Change color in ISH*med planning grid

Hello SDN,

In the ISH*med planning grid, I like to change the color according to the type of admission. This make the planning grid better to understand for the people at the 'admission desk'. Do you know a way to do this?

E.g. with which BAdI of BAPI?

I tried to change to color with the implementation of the BAdI 'N1_PG_LABEL_APP'. Unfortunately this doesn't work.

Best regards,

Johan