Answer:
It is possible that the module determines a high required reinforcement for SLS checks if it is not possible to fit the provided reinforcement into the cross-section or rather into the reinforcement layer. It is also possible that the deflection analysis leads to a high required reinforcement.
Solution
One solution might be to increase the maximum number of reinforcement layers. With a higher number of reinforcement layers, it is possible to provide a higher reinforcement (Image 01).
For deflection analyses, it another solution might be to disable the automatic increase of the longitudinal reinforcement for the serviceability limit state design and to define a minimum reinforcement (Image 02). In combination with other SLS checks, it could be useful to calculate the deflection analysis in a separate case.
