Answer:
When determining the punching load from shear forces in the critical perimeter in RF‑PUNCH Pro, the "Consider surface load inside the critical perimeter" option is available at the end of Window 1.5.
If you select the "Determine" option, the program requires a clear load situation. This explicit load situation is not given when applying the result combination (RC). Therefore, you receive the mentioned message No. 58.
You can avoid this problem by entering the surface load inside the critical perimeter manually, or by using load combinations (COs) instead of result combinations (RCs) in your calculations.
