For a 1065 K-1, box 16 is for foreign transactions. You can read the details on pages 14 and 15 here.
You may need to contact the issuer. You need the income invested in the foreign country, what country and how much tax was paid to compete the form 1116 for credit for tax paid to a foreign country. What you have listed may be all the correct information, but it isn't matching up with the instructions so it may be a matter of communication.
@SueJohnson
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