What is the use of Feature NUMKER?
NUMKR is the Feature helps when you are hiring a new employee(Personnel number), you can customize  whether it should be internal number range or External number range. 

What is the use of control record?
Control Record Play a very important role in Payroll.   Payroll Control Record is created for each payroll area.
-> It determines current payroll period for the exact date.
-> It defines the Payroll past for the retroactive accounting recognition.
-> It Locks the Master Data and Time Data to prevent changes from being made during the payroll run.
-> This Lock is Valid for the payroll past and Payroll present. Changes which affect the future can still be made.
->  It determines the earliest retroactive accounting period.

Are you able to perform more than one action in the same day?
Yes, you can do on the same day, you can hire and you can terminate.

What is the functionality of time constraints?
When you update an infotype, old data is not lost but archived for historical evaluation. The system records a specific period of validity for each infotype, This enables the system to store more than one infotype record at the same time, even if their validity periods overlap. This means that the time relationships between infotype records must be defined. 
HR Master Data uses the following Time Constraints:
Time Constraint 1
For the entire time that the employee works at the enterprise, exactly one valid infotype record must exist. The validity periods of the individual records must not overlap. If a new record is created, the system automatically uses the start date of the new record as the delimitation date of the old record. Gaps are only allowed between the employee’s entry date and the start date of the first record.
Time constraint 1 must be used for all of the infotypes containing information that must be available at all times. This is particularly true of personal and organizational assignment data.
Time Constraint 2
No more than one valid record can exist at any one time. Records with constraint 2 must not overlap. Their existence is not obligatory. If a new record is created, the system automatically delimits the previous record, if one exists.
If a record is delimited because of time constraint 2, the system displays an appropriate message.
Time Constraint 3
Any number of valid records can exist at any one time. The individual records do not conflict with each other.

To implement SAP Payroll what are the mandatory modules for HR.
Payroll is the Central Component in SAP HR.
PA, TIME and OM are important.

What are the types of break schedules?
You can define Work Break Schedules for your enterprise. You have to specify exactly when     breaks May be taken within the daily work schedule (DWS), and you have to mention that these breaks Are paid or unpaid.  All this you have to configure as per your client / business requirement.
Example : You can define break schedules (Tea Break) 9:45 am to 10 am;
               Lunch Break 1 Pm to 1: 30 pm & Snack or Refreshment Break : 3 Pm to 3:15 PM.
You can configure whether these breaks are paid are unpaid as per your client requirement.
These Breaks you assign it to your Daily Work Schedule (DWS)
      
To generate a work schedule what are the parameters required.
You make the settings required for creating work schedules in your enterprise. Work schedules are shift schedules which must be generated for all employees, even those with a set working time (salaried employees) or flextime. Elements of the work schedule include daily work schedules, period work schedules, and work schedule rules.
Work Schedules are generated from the system by applying the work schedule rule to a calendar. The working times defined for employee groupings and individual employees are based on these work schedules.

What is the use of a counting rule?
You define rules for counting attendances and absences. The rules are used to determine the payroll days and hours for an attendance or absence. The payroll days and hours that have been counted are used to control the deduction of quotas. They can be used in Payroll to valuate the absence.
A counting rule can comprise several individual sub-rules. The sub-rules are numbered sequentially. The system runs through the individual sub-rules until it finds a rule that applies.

Define base & accrual entitlements?
If you set the rules for determining the base entitlements to an absence quota type. The base Entitlement forms the basis for calculating the prorated leave or absence entitlement for each Accrual period.
If you determine the base entitlement according to the employee’s age or seniority, you enter a  Constant expressed in days or Hours. The base entitlements are set for specific period. 

How to generate Absence Quotas?
Use T/Code SE38, and give report RPTQTA00, then execute it to run Absence quota.
 
Perform the following stepts,
SPRO--> Time Management--> Time Data Recording and Administration--> Absence--> Absence Catalog

Group PSA for Attn/ Abs
Define Absence Type
Determine Entry Screens and Time Constraint
Define Counting Class for PWS
Rules for Absence Counting (NEW)
ESG groupings for Time Quotas
PSA groupings for Time Quotas
Define Counting Class
Counting Rule
Deduction Rule (Create and Assign in Counting Class after creating the Absence Types) 
Assign Counting Rules to Absence Types

SPRO--> Time Management--> Time Data Recording and Administration-->Managing Time Accounts using Attn/Abs Quotas--> Time Quota types

Define Absence Quota Types

SAP Reference Books:
SAP Human Resource Certification, Interview Questions and Configuration Reference Books

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