The partial entanglement entropy (PEE) $s_{mathcal{A}}(mathcal{A}_i)$ characterizes how much the subset $mathcal{A}_i$ of $mathcal{A}$ contribute to the entanglement entropy $S_{mathcal{A}}$. We find one additional physical requirement for $s_{mathcal{A}}(mathcal{A}_i)$, which is the invariance under a permutation. The partial entanglement entropy proposal satisfies all the physical requirements. We show that for Poincare invariant theories the physical requirements are enough to uniquely determine the PEE (or the entanglement contour) to satisfy a general formula. This is the first time we find the PEE can be uniquely determined. Since the solution of the requirements is unique and the textit{PEE proposal} is a solution, the textit{PEE proposal} is justified for Poincare invariant theories.
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