FUNCTION MODULES USED IN ALV REPORTS of SAP ABAP

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FUNCTION MODULE(FM) USED IN ALV REPORTS :

Using ALV, We can have 3 type of reports : 
1).Simple Report. 
2).Block Report.
3).Hierarchical Sequential Report.

1).SIMPLE REPORT:
The important function modules are:
A).REUSE_ALV_LIST_DISPLAY : Output a simple list (single line or several lines) or Display an ALV list as per the parameter defined in the functional call.
B).REUSE_ALV_GRID_DISPLAY : Output a simple grid (single line or several lines) or Display an ALV grid as per the parameter defined in the functional call. 
C).REUSE_ALV_COMMENTARY_WRITE : List body comment block output or display the list header information.
D).REUSE_ALV_EVENTS_GET : Return table of possible events for a list type.
E).REUSE_ALV_FIELDCATALOG_MERGE : Create field catalog from dictionary structure or internal table.
F).REUSE_ALV_VARIANT : Display a variant selection dialog box.
G).REUSE_ALV_VARIANT_EXISTENCE : Check the existence of the variant display. 
H).REUSE_ALV_EVENT_NAMES_GET : Return table of constant name of possible event for a list type.
I).REUSE_ALV_LIST_LAYOUT_INFO_GET : Read current ALV list information.
J).REUSE_ALV_LIST_LAYOUT_INFO_SET : Set current ALV list information.
K).REUSE_ALV_LIST_WIDTH_GET.
L).REUSE_ALV_POPUP_TO_SELECT : List in dialog box to choose one or more entry (or display only).
M).REUSE_ALV_VARIANT_DEFAULT_GET : This function module is used to get the default variant.

2).BLOCK REPORT:
This is used to have multiple list continuously and the important functions used in this report are: 
A).REUSE_ALV_BLOCK_LIST_INIT : This function module is used to set the default gui status etc.
B).REUSE_ALV_BLOCK_LIST_APPEND : This function module add the data to the block. Repeat this function for all the different block to be displayed one after the other.
C).REUSE_ALV_BLOCK_LIST_HS_APPEND : This function module is used for hierarchical sequential block.
D).REUSE_ALV_BLOCK_LIST_DISPLAY : This function module display the list with data appended by the above function.

3).Hierarchical Reports:
Hierarchical sequential list output. The function module is
A).REUSE_ALV_HIERSEQ_LIST_DISPLAY:
(Hierarchical sequential list output) - Display two internal table that are formatted in the hierarchical sequential list format. 

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