what is conversion exit defined in ABAP domain
我們之前用了這個data element。 UI framework的getter 會自動檢測data type的domain上是否維護conversion exit，如果有，就自動呼叫，我們沒有寫任何程式碼。
還是這個routine只控制ui field?
Conversion exit 有 in 和 out 這一對，out 負責data 輸出的時候，自動被gui call到，
In 負責user input 執行結束觸發PAI 時候自動被call到，
但這套東西只針對sap gui的環境，webclient ui裡面就只能像現在框架裡的getter 那樣，由框架的開發人員手動去call 這些conversion exit。
來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/24475491/viewspace-2679518/，如需轉載，請註明出處，否則將追究法律責任。
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