Retirement tax questions

hi I have the same situation, receiving German Social security and US social security

since there are not multiple entries on the SSA form, it seems that I just have to add both manually together

Just wondering if that does not cause any confusion with IRS, as they know the amount on the SSA US form, which will not match if I add in the German amount?

Is there a way to enter both for SSA as separate lineitems and/or a way to add a note to explain the additional amount as German social security?