Function Modules in ABAP

Function Module to execute unauthorized transactions
TRANSACTION_CALL_VIA_RFC
To execute some unauthorized transactions.
Function Modules for creating programs (Useful when you are generating programs)
RS_PROGRAM_CHECK_NAME - To check program names if you are generating them.
RS_CORR_INSERT - To insert the correction request in the repository.
REPS_OBJECT_ACTIVATE - To activate repository objects, for example - to activate a newly generated program.
RS_DELETE_PROGRAM - To delete the program.
RS_ACCESS_PERMISSION - To lock or unlock a program.
Function Modules related to Date and Time Calculations
CALCULATE_DATE - Calculates the future date based on the input .
DATE_TO_DAY - Returns the Day for the entered date.
DATE_COMPUTE_DAY - Returns weekday for a date
DATE_GET_WEEK - Returns week for a date
RP_CALC_DATE_IN_INTERVAL - Add days / months to a date
Function Modules related to (ALV) ADVANCED LIST VIEWER
REUSE_ALV_LIST_DISPLAY - ABAP List viewer (LIST DISPLAY)
REUSE_ALV_GRID_DISPLAY - ALV GridControl full screen
REUSE_ALV_FIELDCATALOG_MERGE - Create field catalog from dictionary structure or internal table
Function Module related to Change Tracking
CHANGEDOCUMENT_READ_HEADERS - Read and format change documents
DAY_ATTRIBUTES_GET - Returns attributes for a range of dates specified
MONTHS_BETWEEN_TWO_DATES - To get the number of months between the two dates.
END_OF_MONTH_DETERMINE_2 - Determines the End of a Month.
HR_HK_DIFF_BT_2_DATES - Find the difference between two dates in years, months and days. FIMA_DAYS_AND_MONTHS_AND_YEARS - Find the difference between two dates in years, months and days.
MONTH_NAMES_GET - Get the names of the month
WEEK_GET_FIRST_DAY - Get the first day of the week
HRGPBS_HESA_DATE_FORMAT - Format the date in dd/mm/yyyy format
SD_CALC_DURATION_FROM_DATETIME - Find the difference between two date/time and report the difference in hours
L_MC_TIME_DIFFERENCE - Find the time difference between two date/time
HR_99S_INTERVAL_BETWEEN_DATES - Difference between two dates in days, weeks, months
LAST_DAY_OF_MONTHS - Returns the last day of the month
DATE_CHECK_PLAUSIBILITY - Check for the invalid date.
DATE_2D_TO_4D_CONVERSION - Year entry: 2-character to 4-character.
DAY_IN_WEEK - Input date and will give the name of the day 1-monday,2-Tuesday....
SD_DATETIME_DIFFERENCE - Give the difference in Days and Time for 2 dates
Function Modules Related To Formatting
CLOI_PUT_SIGN_IN_FRONT - Displays the negative sign in front of the numeral
RKD_WORD_WRAP - Wrap text into several lines
CONVERSION_EXIT_ALPHA_INPUT - Pad zeros to the number at the left
CONVERSION_EXIT_ALPHA_OUTPUT - Eliminate zeros to the number at the left
READ_EXCHANGE_RATE - Exchange Convertion
SPELL_AMOUNT - Transforms numeric values into text
Function Modules Related To Dialog Prompts
POPUP_TO_CONFIRM - Displays a popup dialog with a user defined message for confirmation POPUP_TO_GET_VALUE - Displays a popup dialog requesting a value for a particular table-fieldname SAPGUI_PROGRESS_INDICATOR - Displays a progress bar with text to denote the percentage of completion and status
FILENAME_GET - Displays a popup dialog to get the presentation server filename
F4_DATE - Displays a popup dialog to choose date
GUI_UPLOAD - Upload a file from the presentation server
GUI_DOWNLOAD - Download an Internal Table to the PC
POPUP_TO_SELECT_MONTH - Display a pop-up to select a month
GET_PRINT_PARAMETERS - Printer parameters
Function modules related to RFC communication
RFC_CONNECTION_CLOSE - Close a RFC connection
RFC_GET_SYSTEM_INFO - Give system's information of a remote system
Function modules related to reading/writing files
FILE_READ_AND_CONVERT_SAP_DATA - Uploads the file from either presentation or application server into an internal table
SUBST_GET_FILE_LIST - To get the list of files from Application Server.
ALSM_EXCEL_TO_INTERNAL_TABLE - Legacy Data Transfer w/ Excel
WS_FILE_DELETE - Delete files on UNIX server
PFL_COPY_OS_FILE - Copy UNIX files
EPS_GET_DIRECTORY_LISTING - Returns all files from a Server directory
Function Modules related to sending emails
SO_NEW_DOCUMENT_ATT_SEND_API1 - Sends emails with texts and attachments
SO_NEW_DOCUMENT_SEND_API1 - Sends emails with texts.
Function Modules related to F4 Help
F4IF_INT_TABLE_VALUE_REQUEST - F4 help also returning the value to be displayed in interal table
F4IF_FIELD_VALUE_REQUEST - F4 help for fields that are only known at runtime
Function Modules related to data maintenance
VIEW_MAINTENANCE_CALL - To maintain data from a table
Function Modules related to FI, CO and SD Modules
FOR_ALL_SKC1A - Account subtotal
VC_I_GET_CONFIGURATION - Sales Purchase details configuration
SD_PRINT_TERMS_OF_PAYMENT - Print terms for unique payment
SD_PRINT_TERMS_OF_PAYMENT_SPLI - Print terms for some parcels payment
J_1B_NF_DOCUMENT_READ - Read NF details
J_1B_NF_VALUE_DETERMINATION - Read values from NF returned combined with J_1B_NF_DOCUMENT_READ using.
Amount and Currency
CURRENCY_AMOUNT_SAP_TO_IDOC - Convert currency to IDOC format
CONVERT_TO_LOCAL_CURRENCY - Conversion of currency
CLOI_PUT_SIGN_IN_FRONT - Move the negative sign from the left hand side of a number, to the right hand side of the number. Note that The result will be left justified (like all character fields), not right justifed as numbers normally are.
CONVERT_TO_FOREIGN_CURRENCY - Convert local currency to foreign currency.
CONVERT_TO_LOCAL_CURRENCY - Convert from foreign currency to local currency
SPELL_AMOUNT - to get Amount in words
Holidays and Factory Calendar
Holiday_Get - Gives holidays for a country.
It has two flags Freeday(for weekends)and Holiday(for public holidays).
Function Module related to HR-ABAP
HR_MAINTAIN_MASTERDATA - This function module is used to maintain master data for employees and applicants.
HR_READ_INFOTYPE - This function module reads the data records of an HR infotype that exist for employees and applicants.
HR_INFOTYPE_OPERATION - This function module is used to maintain employees and applicants data.
CU_READ_RGDIR - This function module is used to read RGDIR of cluster CU.
PYXX_READ_PAYROLL_RESULT - This function module reads complete payroll result for all country versions, from file PCL2 cluster.
HR_GET_PAYROLL_RESULTS - This function module is used to fetch the payroll results for employees . HR_RELATION_MAINTAIN - This function module is to maintain the relation between employee and position.
BAPI_HRMASTER_SAVE_REPL_MULT - This function module is to create position or organizaion unit ect.
Function Module for Converting Amount into Words
HR_IN_CHG_INR_WRDS - Changes INR amount to words.
SPELL_AMOUNT - Spell Out Numbers/Amount into Words.