Hi
Hope you are aware there is basic principle for defining a sequence in access sequence. That is you maintain most specific key combination at the top and most general key combination at the bottom. For reference you can refer Pricing Procedure in SD - ERP Operations - SCN Wiki
For you ideally, for above sort of access sequence value are not maintain in step no. 10/12/14 to make other relevant for pricing. If like to improve your access sequence then it should be as the following:
| Step No. | Table Desc |
| 10 | Sales Org./Ref.Doc./Ref.item |
| 20 | Country/State/Customer Classif.1/Material Classification1 |
| 30 | Country/Plant/Ctrl Code/TaxCl1Cust |
| 40 | Country/Plant/Ctrl Code/Ship-to |
| 50 | Country/Plant/Ctrl Code/Material |
| 60 | Country/Plant/Ctrl Code/ |
| 70 | Country/NBM-NCM Code |
| 80 | Customer/Material |
| 90 | Material |
Thanks, JP