AME Final Approver List - Limit?

Hi all,

I am using EBS 12.2.5.  I have a question about AME for Purchase Requisition Approval.  Please let me know if this question belongs in a different place.

We use parallel approvals / beat by first responder.  Our current setup includes 24 actions for 1 condition.  The rule type is post-chain-of-authority-approvals.  The actions are "require post-approval from cost center 1 group 1" then cost center 2 group 1... cost center 3 group 1... etc. until cost center 12 group 1; then cost center 1 group 2, cost center 2 group 2, etc. to cost center 12 group 2.  Configuration variable for repeat approvers is "once per group or chain."

I have a requisition that is not able to generate an approver list.  There are 12 lines/distributions, each with a different cost center.  Each cost center on this requisition has the same 6 approvers, and only 1 approver group each (no dollar threshold).  It gives an error that approvers are not set up completely for the cost center, until I delete any 6 lines.  Then it generates the approver lists.