違いにおかけになっているようですよ
chigai ni okake ni natte iru yō desu yo
JA
It seems you have made a mistake.
違いにおかけになっているようですよ、こちらの地図が正しいです。
It seems you have made a mistake, this map over here is the correct one.
Etymology
This is a polite Japanese phrasing that combines the polite prefix お-, honorific verb かける (to do something to someone) and the polite sentence ending よ, developed to soften the awkwardness of pointing out another person's error in formal or polite communication.
Memory Aid
Break the phrase into parts: 違い = mistake, おかけになっている = you have done (honorific), ようですよ = it seems. So it adds up to "it seems you've made a mistake."
Related Words
間違い誤り失礼お詫び