Hi Dhanuka,
I am just guessing that it has something to do with the usage of NODIM or NOERR in the formula. Please try the below in a copy query:
You can also try creating two new formulae, one to display only NODIM(ONTIME) and the other for NODIM(ORDQTY), hide these formulae and then use them in the key figure, just to make sure that the presence of NODIM in the formula is not contributing to the missing of the "%" function.
If this doesn't work just try omitting NOERR and look at the results.
I guess its all trail and error thats going to let us know the exact source of the issue. As the percentage share would display the symbol in every record if display scaling factor is unchecked.
Regards,
Manohar. D