Error when processing Pay later contribution
I'm relatively new to CiviCRM and realize this is an old thread, but I just got the same error on Wordpress 4.7.4 and CiviCRM 4.7.15. I was trying to record a update a membership based on a cash payment. Screen shot below shows the error received. I unchecked "Update Payment Status" and was able to save and continue. I had to add a new contribution for this person after saving the the membership changes.