Shared data
Products, partners, stock and orders read from the ERP, so a figure changed on a phone is the figure everyone else sees.
Applications built as an extension of the ERP, so operational interfaces can be simplified without creating a second source of truth.
In scope
What ERP integration covers
Four things an application inherits from the ERP rather than keeping its own copy of.
Shared users
One account per person, with the permissions their role already carries, rather than a second directory to maintain.
Shared transactions
What the application records is a transaction in the ERP, posted once, not a message to be imported later.
Role-specific mobile screens
The subset of the system a job actually needs, on the device that job is done on.
An application that keeps its own records becomes a second source of truth, and a second source of truth becomes somebody's weekly job. Building onto the ERP is what stops that job existing.
What changes
Three things that stop
Importing yesterday
The record is written where it belongs, when it happens.
A second login
One account, one set of permissions, one place to revoke it.
Reconciling two figures
There is only one, and everything reads it.