FP_VT3: Update scheduling rule on the provider contract

How tin we update the tract "Scheduling" (DFKK_VT_I-INV_SCHEDULE) connected the supplier declaration level alternatively of declaration relationship level? The tract is disposable connected tab 'Items: Convergent Invoicing'. 
Scheduling diagnostic is defined successful the CI strategy and we are capable to update it successful Contract relationship level but we could not find a mode to update it connected supplier declaration portion created solution quotation ->subscription contract-Provider declaration flow. 

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