I recall in one of my previous implementation we used these bunch of AIF and custom web services to communicate between Dynamics AX and SAP.
This comes as a good news as Microsoft announced a new connector that accelerates two-tier enterprise resource planning (ERP) deployments between Microsoft Dynamics AX and SAP Business Suite. This new connector enables IT organizations to use Microsoft Dynamics AX across subsidiaries, divisions or branch entities to facilitate cost-effective business process integration and easily connect with SAP installations at the corporate headquarters location.
The Microsoft Dynamics ERP two-tier connector will enable common business process integration scenarios for headquarters and subsidiary locations, including the following:
• Financial consolidation. The sharing and consolidation of detailed financial information from subsidiaries using Microsoft Dynamics AX can be automated and exposed through a central SAP installation, increasing visibility of financial performance across the organization.
• Intercompany supply-chain integration. The integration of intercompany procurement and supply-chain processes between local and regional distribution with centralized fulfillment organizations helps facilitate automated order processing.
• Plant automation. Integration of decentralized manufacturing operation processes into centrally orchestrated planning processes enables more accurate and responsive manufacturing planning across the organization.
Integration can easily be customized by using Microsoft BizTalk Server to provide sample mappings for electronic data interchange and detailed technical documentation.
Read more here http://www.microsoft.com/presspass/press/2010/may10/05-17MSTwoTierERPPR.mspx