Hello there; If you pay attention, this message is given with the title WARNING. In other words, it may or may not be an error, but you, as the engineer who designed it, will decide. Namely; In your project, the curtains that do not meet the 1/6 condition are each part of the group curtain and there are other curtain arms that meet the 1/6 condition of the group curtain in the X direction, in this case there is no problem in your design. As of V10.17, this and similar group curtain parts that do not meet the 1/6 requirement are designed like the headboard area. See attached screenshot. Best regards.