If the return was rejected for the reason "If Item H checkbox is not checked and Line 1 has a value equal to or greater than 5,000, then Schedule B (Form 990, 990-EZ, or 990-PF) must be attached to the Return (Rule Number: F990EZ-034-01)," you will need to check the box for Item H.
To get Item H checked, you must indicate the reason on Schedule B. For example, if you check "General Rule" on Schedule B, the "Schedule H" checkbox will be checked.
To enter or review information on Schedule B:
For additional information regarding Form 990 e-file rejections, contact the IRS Help Desk at (866) 255-0654.