Data entity methods execution sequence in Dynamics 365 F&O X++

 Here is a sequence of method’s calls during export:

1. initValue
2. validateField
3. validateWrite
4. update
4.1. doUpdate
4.1.1. persistEntity
4.1.1.1. doPersistEntity
4.1.1.1.1. initializeDataSources
4.1.1.1.1.1. initializeEntityDataSource
Note: initializeDataSource is called once for each DataSource in Entity.
4.1.1.1.2. mapEntityToDataSources
Note: initializeDataSource is called once for each DataSource in Entity.
4.1.1.1.3. saveDataSources
4.1.1.1.3.1. updateEntityDataSource
4.1.1.1.4. mapEntityToDataSource (maybe for another record)
4.1.1.1.5. saveDataSources
4.1.1.1.5.1. updateEntityDataSource for update operation and (insertEntityDataSource for insert)
4.1.1.1.5.1.1. mapDataSourceToEntity
4.1.1.1.5.1.2. doSaveDataSource
4.1.1.1.5.1.2.1. updateDataSource
4.1.1.1.5.1.2.1.1. preupInsertDataSource
4.1.1.1.5.1.2.1.1.1. validateWrite of table
5.0 postLoad


Here are some method’s calls during Import:

defaultCTQuery
copyCustomStagingToTarget
postGetStagingData
preTargetProcessSetBased
postTargetProcess

Source: Data entity methods execution sequence in Dynamics 365 F&O X++ - Dynamics 365 Finance Community