Error: Unable to write code as the combination of code, course number and grade already exists. 

Error 400: writeSchoolCode 




Please check to make sure the code is not expired. 
1) From the Board Level, please go to Setup > Codes 
2) Then click the ellipsis to show more options and select "Show Inactive codes":  


3) Now, search the code you are trying to add and review the effective dates of that code.  

4) It is possible that the code you are trying to add has expired?