RZA from Wu-Tang -- I Owe Dutch Singer Squat

RZA from the Wu-Tang Clan says the hot Dutch singer who's suing him greatly over exaggerated her role in HIS hit songs, and is adamant he doesn't owe her a dime.

RZA is firing back at Thea Van Seijen -- who filed a suit claiming she co-wrote and sang on 14 songs with RZA (including the hit "Baby Boy") but only received a fraction of what she's owed.

In docs RZA admits he worked with TVS on a slew of tracks, but says she was merely work-for-hire (for which she got paid) and NOT a co-author on the songs.

Not only that, he says he NEVER promised royalties or additional payments -- and she's lying if she says otherwise.

FYI -- Our photog caught up to RZA recently on the streets of L.A. and he explained his side of the story ... check it out.