Hi Simon!
(Notice that I changed the location of this topic to RQS Suite -> Quality Metrics -> Correctness )
This message is the result of the Correctness metric: "R16 Non Ambiguity - Conjunction "both X and Y" (Avoid)". Please note that this metric is a Pattern Matching parameterized metric, meaning that it is based on a Pattern. The objective of the metric is to detect the textual structure "both (something) and (something)", that should be avoided in specifications.
Hope you find this information useful.
Regards,
Javier