To grant/allow miscellaneous fee collection along with the regular fee, follow the below-mentioned path.
Settings ---> Organisation ---> Organisation Settings ---> Click on Finance Settings ---> Click on Privilages For Accountant ---> Click on the Edit button against Allow misc fee collection along with the regular fee ---> Click on Yes/No ---> Save.
Note: The accountant can collect a miscellaneous fee along with the regular fee when this setting is 'YES'.