When the jet is off map, there's no terrain data available, and DTS can't be used for elevation data.
Normally, next to your distance to waypoint, you have DTS. That indicates that DTS is the source of the elevation data.
When offmap, ther will be XXXX
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Without elevation data, you will get CCIP invalid indications when trying to do gun runs, bombing,... because the computer is missing that elevation data.
Now, we can overcome this, to switch to HOT elevation (manual entry)
A JTAC, FAC,... would give you this information. In DCS, you also could just grab it from the F-10 map.
You enter it, by using the DATA rocker on the UFC, to switch to manual entry with the SEL(ect) rocker. You either type the number on the scratchpad and ENT(er) to put it in, or use the DATA rocker to go up/down to the correct elevation.
in the screenshot below, I've set it to 670ft
With the elevation set, you see that weapon delivery is possible again