Breakdown of seikyuuteisei o onegaisuru.

Questions & Answers about seikyuuteisei o onegaisuru.
It is read:
請求訂正をお願いする。
せいきゅうていせい を おねがいする。
- 請求 = せいきゅう
- 訂正 = ていせい
- お願いする = おねがいする
They are being used as a compound noun.
So 請求訂正 works like a compact business-style expression, similar to English noun stacks such as billing correction or invoice correction.
A more explicit version would be:
- 請求の訂正
- 請求書の訂正
Those sound a little clearer in many situations. The version without の is more compact and can sound businesslike, administrative, or note-like.