That depends. Sometimes, this idea is incorrect. IATI results and indicators can have many ways of measuring. There are in fact five, including qualitative indicators. Have a look here and see if one of them fits to your results https://iatistandard.org/en/iati-standard/203/codelists/indicatormeasure/.If you use non-numerical measures like qualitative indicators, METIS will of course not visualise it in an aggregated way, but you will still have reported your results in IATI, in a way that fits the nature of the activity. This is in line with the MFA Guidelines.

As a last resort, you could attach a narrative document on the results to your IATI report on this activity. This will mean the results will in many ways be invisible so try to avoid it. If you want to discuss if  there is a better solution for your situation, contact us.