IT service provider seeks comprehensive CRM or ERP or merchandise management system

We are an internationally active IT service provider and software developer for the aviation industry. To optimize our business processes, we are looking for a customer relationship management system, preferably with extended functions, or a simple ERP or merchandise management system. We work on projects with different durations (one year, two to three years) from project creation to quotation, order, goods receipt, and invoicing.

We have the following requirements for the software:

• Master data management (supplier, customer, and article master)
• If possible, migration of data from the legacy system (large supplier and customer master, article master approx. 100 articles - mainly hardware components)
• Purchasing (creating orders)
• Invoicing (assigning invoices to orders and projects and posting them)
• Approval workflow for large invoice amounts, if necessary
• Logistics (generating delivery notes for orders)
• MS Access, MS Excel, MS Word for quotations and posting goods and posting them to customers with delivery notes
• The system should have a modular structure so that it can be expanded later if necessary
• Interfaces to DATEV and IT documentation
• On-premises or web-based when installed on your own server

Initially, five to six software workstations are planned. However, these are to be expanded over time.