Driver Priority Sequece in Standard Profitability Application

I have Intra & Inter stage allocations in my standard profitability model.

I have defined driver sequence priority as stated in 11.1.2.3 HPCM user guide, which is  " The sources associated with drivers that have a lower priority are resolved before sources associated with a driver that has a higher priority."

After following this sequence, i'm still getting this error during calculation , " This source node has a driver association with a driver with priority sequence that conflicts with the natural order of intra-stage cost flow."

Please share any observations if you have.