Revit imposes undocumented limits on hatch pattern scale. The first message arises when some element within the pattern is too small - Revit's smallest line length is 1/32' and that is quite a reasonable restriction.
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The second message, issued when a pattern has elements with repeat distances greater than about 70 feet, is less understandable. The upper scaling limit can be avoided by using the HatchKit Add-In for Revit to load patterns. Without the Add-In HatchKit can adjust hatch pattern elements to fall within Revit's scaling limits when loaded with 1:1 scaling.
Hugh Adamson.