It is possible but this causes additional stress, slowing growth and development. Rooting may take up to three times longer when the cuttings are taken during the flowering cycle. The cutting may not have enough stored nutrients or carbohydrates to survive.
I recently took clones from plants which were in the flowering cycle. The clones were speckled with crystal and still took. Everything seemed fine but after putting the clones into flowering they began growing a little funny. Check out the picture. I am wondering if there is another variable at work. They were stretching for light for 3 days while I was away on vacay and I put them into flowering a little earlier then I should have.