Hi, Please note that updating the campaign budget type is not possible through the Google Ads API, which is why you're seeing the 'IMMUTABLE_FIELD' error. I would recommend you to refer to this documentation, as it specifies that this field is immutable which means that once it's set, it cannot be modified. This message is in relation to case "ref:!00D1U01174p.!5004Q02vGgKA:ref" (ADR-00272909)
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