differenec between key and text at IO level and Query designer level

Hello All,

Could you please tell me the exact difference between key and text settings at infoobject level and Query designer level , which one rules .

also i have a case where for 2 infoobject s

there is no description and only key is present

but when setting is changed to key and text at designer level

the 1 st infoobject displays key at both places (key and text place) and

2nd infoobject displays key at keys place and balnk at text place

Could any one please clarify

Thanks in Advancem,

Harshitha