Abaqus - Import Rigid Body Constraint

Hi all,

How can I import a rigid body constraint between one tie node and the RP, from an Abaqus/Standard to an Abaqus/Explicit analysis? Basically I want to connect rigidly a node to a RP. But when I define a predefined initial state field in my Abaqus/Explicit analysis, the reference point stays exactly where it was initially defined and does not follow the deformed coordinates from Abaqus/Standard. How can I resolve this?

Thank you.

Abaqus