Account codes are commonly used for sending invoice and credit data to MYOB. Disciplines and cost centers are attached to all stages in Synergy. For supplier bill and staff expenses use the expense type mapping option.
Go to: Organization > Settings > Project lists, and open either disciplines, cost centers, or expense types lists.
The current cost discipline / cost center / expense type options are shown, along with the column 'Account code'.
Add the missing account codes to these items by: Click the edit pencil button on the right, and select 'Edit'. Type the required account code. e.g. Invoice account 4-1200 for MYOB AccountRight Live or 200 for Xero, or Expense account 429 for Xero or account 6-1190 for MYOB AccountRight Live. Save and close.
Repeat for each discipline / cost center / expense type.
Save and close.