<mutate xmlns="https://adwords.google.com/api/adwords/cm/v201509"><operations><operator>ADD</operator><operand><campaignId>241400475</campaignId><criterion xsi:type="Proximity" ><radiusDistanceUnits>MILES</radiusDistanceUnits><radiusInUnits>20</radiusInUnits><address><cityName>Tiel</cityName><provinceName>Gelderland</provinceName><countryCode>NL</countryCode></address></criterion></operand></operations></mutate>
Could you please verify that your SOAP XML request looks exactly the same for the two requests and that it looks similar to what I've sent? If they are exactly the same and you're still experiencing issues, please choose Reply privately to author from the drop-down when replying and include the SOAP XML request.
Thanks,
Nadine, AdWords API Team