Select a range of values on text, not on key

Dear experts,

Here comes my question. Is there a way to select a range based on the text of a characteristic, instead of on keys?

For example, we have an infoobject ZXXX, there are five data records looks like:

Key Text

1 e

2 d

3 c

4 b

5 a

In the web interface for you to select a value range, what you can see is a list of text, ordered by text:

a

b

c

d

e

You want to select the range from c to e, then you will get an error that the range is not valid, because the key for the range is actually from 3 to 1, the lower range is greater than the higher range.

Thus, is there a way for the user to select a range based on text, not key?

Any help would be appreciated by good points.

Thank you in advance,

Shawn