The RLL relation for the elliptic quantum group L-operator

Let $\widehat{L}^+(v)\in\operatorname{End}(\mathbb{C}^N)\otimes U_{q,p}(\widehat{\mathfrak{sl}}_N)$ be the L-operator constructed from the half currents, and let $R^+(v,P)$ be the evaluation $R$-matrix of the universal $R$-matrix of ${\cal B}_{q,\lambda}(\widehat{\mathfrak{sl}}_N)$. For tensor factors $1$ and $2$, write $\widehat{L}^{+(1)}$ and $\widehat{L}^{+(2)}$ for the corresponding copies, and let $P$ and $h$ denote the dynamical Cartan variables appearing in the relation. The RLL relation. The L-operator satisfies

$$R^{+(12)}(v_1-v_2,P+h)\widehat{L}^{+(1)}(v_1)\widehat{L}^{+(2)}(v_2)=\widehat{L}^{+(2)}(v_2)\widehat{L}^{+(1)}(v_1)R^{+*(12)}(v_1-v_2,P).$$

This relation is conjectured from comparison with the half-current relations and is intended to identify the L-operator realization of the dynamical elliptic quantum group; the source provides no resolution of the conjecture.