Thanks for your Help. This seems to be what I'm looking for, but...... I've added the object S_SCRP_TXT to the role and I can now modify the values for the Text ID authorization field and each Text ID appears to have an associated Text Object. The problem now is there are over 500 values and I'm unable to restrict the Text ID/Text Object Z919/VBBK because it's not included in the first 500 results, see below.
How can I allow all values except Z919/VBBK (or any other specific value) not displayed in the restrictions list?