RBE2 Constraints & CBEAM

Hello everyone, In my research I have found, that CROD elements support tension and compression only, whereas CBEAMs allow bending as well. Thats why I am thinking to use CBEAM elements to simulate a pullrod but I am not really sure.

My main point is to establish a connection between pullrod-bracket (upper left orange part) and pullrod which is modeled as CBEAM elements, so that the connection is only locked along pullrod (CBEAM elements). Like in picture 3, I used RBE2 and locked dof 1,2,3 (no constraint). Like in picture 2, I used RBE2 (all dofs locked) and additionaly I defined a constraint, that it is only locked DOF 1,2,3. After I run the analysis, I get an error :   ' ** ERROR # 725 *** An invalid rigid element. This RBE2 has rotational rigid body modes in all three directions. '.

Could you give me some suggestions, what is wrong or am I thinking the wrong way? By the way, I also have tried to define a diagonal constraint (along pullrod) directly on the independent point (pic 3) but I failed to assign the local axis system for this case.

Thanks in advance,
best regards.

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