Conversion is one time effort during the initial implementation or new business implementation.
Usually, the conversion programs have less validation than the interfaces, and the volume of the data will be high.
Most Common Conversions
Item
BOM
On Hand Quantities
Employee and Employee Details
Supplier, and Customer Details
Open Requisition and Purchase Orders
AP and AR Open Invoices
Assets
Project Budget, Billing, Contracts, Agreements and Funding