1099-R Inherited IRA

I have a non-spousal Inherited IRA. I took a required distribution and received 1099-R. However, on the IRS 1099-R form the IRA/SEP/Simple box is NOT checked (next to box 7). Shouldn't my financial institution have checked the IRA/SEP/Simple box? The financial institution is telling me that the Inherited IRA is not a standard plan because someone else contributed to it; thus, they won't check the IRA/SEP/Simple box.