Search helps can be used to assign an input help (F4 help) to screen fields. You can do this by creating a search help in the ABAP Dictionary and attaching it to the corresponding screen field.
Also read the following information:
· General information about search helps.
· Information on attaching a search help to a screen field.
· Brief instructions for creating an elementary search help.
· Brief instructions for creating a collective search help.
You can call the complete documentation about the ABAP Dictionary in every maintenance screen of a Dictionary object with Help → Application help.