Screen Personas: No Authorization for F4-help text input box

Hi

We have places an F4-help input box on an SMEN Flavor screen in order to look-up sales orders.
I have entered VBAK as table and VBELN as table-field.

When I try to get get input help from table VBAK using the F4-help button I get the error message "User is not authorized to access table VBAK".
When I look up in SU53 I find the Authorization Object S_USER_PRO.  Must my user have Authorization for object S_USER_PRO?

I entered VBELN at table field and saved. Next time I go in change mode, VBELN as table field is gone (table VBAK is still there). Why?

Later on I will develop a search help and put that in instead of table VBAK. Is that possible and does that require same Authoriation as for a table?

Thanks and regards
Kim