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Dear all, I am trying to define a multi-body deformable surface contact for Optistruct using MBDCNTDS type of interface. Below image shows the doc page for this type of interface. As the docs say, I have made an MBDSRF type node set to use as the deformable surface. I am able to pass this MBDSRF type of set into the SRFID entry of the MBDCNTDS . So no issues with the deformable surface part. However, when I try to make a node set for the SID1 entry in MBDCNTDS, it will not accept any of my node sets which are saved as entity sets. I have tried using many different card images (SET_GRID and many other), still, the SID1 entry of the MBDCNTDS I'm setting up will not see my node set. I would be grateful if you could share any information with me regarding the type of node set I should use which can be passed into the SID1 entry of MBDCNTDS. Relevant info: I'm using Hyperworks 2017 Best regards, Deniz Bilgili