Answer:
Usually, it should be completely sufficient to provide the ceiling slab only with line supports. The rib as a T-beam is already a fixed part of the ceiling anyway.
If you still want to support the member with a nodal support accordingly, you could split the line just before the rib and remove the line support on the rest of the piece. When using this method, no warning message is displayed during the calculation since both the nodal support and the line support are available on the node at the same time.
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