Let $Y$ be a smooth submanifold of codimension $r$ in a complex manifold $X$. By virtue of the adjunction formula, we always have the isomorphism $$K_Y\simeq (K_X\otimes \det N_Y){\,|\,}_Y.$$ Recall that in the case where $r=1$, i.e., $Y$ is an effective divisor, one gets $$N_Y\simeq \mathcal O(Y){\,|\,}_Y.$$ And thus $$N_Y^*\simeq \mathcal O(-Y){\,|\,}_Y\subseteq \mathcal O_Y$$ where $\iota:Y\hookrightarrow X$ is the natural inclusion. Here is my question: can one give a criterion (or, provide some examples) to guarantee that the following inclusion holds **(in the case where $r\geq 2$)**? $$\det N_Y^*\subseteq\mathcal O_Y.$$ Thanks a lot. EDIT: I have corrected the question, thanks the comments of [abx](https://mathoverflow.net/questions/441904/determinant-of-the-conormal-bundle#comment1140228_441904) and [Jason Starr](https://mathoverflow.net/questions/441904/determinant-of-the-conormal-bundle#comment1140230_441904)!