Display Infotype Name and Number

By default, SAP does not display the infotype name. But you can change it very easily.

Go to menu System => User Profile => Own data

The select last tab called "Parameters".

Then add User Parameter = HR_DISP_INFTY_NUM to the user profile with the parameter value set = X HR (note space between X and HR)

 

Now if you use transaction code PA20 or PA30, you can see the infotype number next to infotype name.