and No. If the F4 help user settings are "Control (amodal)", SAP uses
a special control in which the GuiXT text changes have no effect.
F4 help user settings are "Dialog (modal)", you can use a GuiXT
script. But please observe that the same screen is used by SAP for all
matchcodes, and the field names are always the same (dynamic labels). You have
to ascertain which matchcode is currently displayed. Example:
Q[Page=A: Vendors (General)]
Text F[TabCol1(5)] "Supplier"