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Default Values for Sender Cost Center and Activity Type 
Use
In certain Time Sheet user interfaces, you can fill the working time attributes SKOSTL (Sender Cost Center) and LSTAR (Activity Type) with default values from different sources.

If, in the Variant Cost Assignment group box, the Assignment of Personnel Costs to the Receiver Object indicator is set in Customizing for the data entry profile you use, you cannot use default values for the sender cost center and activity type.
Integration
You can use default values in the following user interfaces of the Cross-Application Time Sheet:
CATS classic
CATS regular
The Time Sheet Defaults infotype (0315) is optional. However, if you transfer data from the Time Sheet to the External Services component (MM-SRV), you must create the Time Sheet Defaults infotype (0315).
Features
In contrast to
personal templates, which enable you to prefill the data entry area when you start time recording, the system first displays default values when you create a new account assignment row with one receiver object and at least one working time:
after you have created an account assignment row.
This is correct, because it does not make sense to provide default values for the sender cost center and activity type, if you are only entering an attendance or absence type.
The system only proposes default values when you create a new account assignment row. If you want default values to be proposed when you change an account assignment row, or if you copy data from the worklist, use the SAP enhancement CATS0002 (Supplement Recorded Data).
The system can take the default values from sources with different priorities. If default values exist that are from different sources, the system uses the following order:
Activities
If required, create the Time Sheet Defaults infotype (0315) for your employees.
Make the following settings in
Customizing for the data entry profiles you need in the Default values group box.See also:
In Customizing, you can store derivation values for specific working time attributes (for example, activity type or wage type) for each task level that you define for a combination of task type and task component. You can make this setting in the Implementation Guide (IMG), under Cross-Application Components ® Time Sheet® Settings for All User Interfaces ® Time Recording ® Specify Task Types, Components, and Levels.
The Business Add-In (BAdI) CATS_DERIVATIVES enables you to make changes to these derivation values. You can find this BAdI in the Implementation Guide (IMG), under Cross-Application Components ® Time Sheet ® Settings for All User Interfaces ® SAP Enhancements and Business Add-Ins® BAdI: Change Derived Values.