Specific beam size assigned in RAM SS does not get designed, and generates an error message .

In a RAM SS model, I tried assigning HSS2.5x2.5X1/4 beam size to a beam. This size is available in the "Assign Size" dialogue box.

However, when I run the design, the following error message is generated and the user assigned size is cleared. Is there a way I can incorporate these sizes into the design? Any help is much appreciated! Thanks in advance!