" The functions Hold data and Set data is used when you want to create a group of objects that contain the same data. The function Hold data can be used to create data that can be changed, for example if you wish to create multiple objects with slight variation in the field values (Sales order or Purchase order) then the function Hold data can be used. If you wish to create multiple objects with exactly the same data without changing any of the filed values then SET data can be used. To hold data on the screen you need to first enter the data in the field and then choose User Profile from the Systems Menu. Now choose Hold data. The data that you hold on the screen can be changed. In case if you wish to hold data on the screen without changing it then select SET data. This way the data will be held but you will not be able to change the contents of the individual fields. You can delete the Data that is held. To do this select User profile from the Systems menu and select the option Delete data. Once the delete Data option is selected no data will be displayed the next time you visit the screen. You may want to work in more than one screen, and would like to store data in each screen, to do this you can press Ctrl+S or click on the save icon while moving between screens. You can also Cancel the data that you have just entered on the screen. To do this press the cancel button. Please note that when using HOLD data and SET data options, the required/Mandatory fields on the screen cannot be ignored. The correct values should be entered in these fields before proceeding to the next screen. Using the menus and functions you can go to the other screens within your task, as well as in related tasks. Check the Goto Extras and Environment menus in the Menu bar to find out the other screens available within your task and related tasks. Depending upon the task the contents also change. "
"The flow of a program is determined by a sequence of screens in a dialog transaction. The screens that are called within a transaction, must belong to a single ABAP program, usually a module pool (Type M). You have to use the transaction maintenance transaction (SE93) to create a dialog transaction. Once you have entered a transaction code and a short description, chose transaction type program and screen. Then enter data on the next screen as required. The transaction code in a dialog program must be linked to the number of its initial screen. Finally enter this number in the screen number field."
Many a times it is required to extract data from several tables this can be a time consuming process. To simplify the process and to increase the efficiency of the code, you can define a VIEW. Data is not stored in a VIEW physically. Here data is combined from several tables, but the data is stored in their respective tables. As the name goes a VIEW is just a VIEW of the selected/desired fields from a number of tables. Fields that are not required are hidden. For example if data needs to be extracted from 5 tables with desired fields, then you can create a VIEW of the required fields.
In SAP ABAP a VIEW can be defined in the following ways.
1) By masking one or more fields from a Table. 2) By Linking tables with a Rational Join Operation 3) By defining join condition from a foreign key defined between the tables
Always specify your conditions in the Where-clause instead of checking
them yourself with check statements. The database system can then use an index
(if possible) and the network load is considerably less.
Always use Pretty Printer and Extended Program Check before releasing the code.
Do not leave unused code in the program. Comment the code thoroughly. Align the comments and the Code. Follow the SAP Standards and SAP Best Practices guidelines. It’s a good practice to take a dump of the code on your local drive.
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