Hello, everybody,regarding events At LAST,AT END,

Question

Hello everybody:
    thank you all in advance for your help!
     What's the difference between at-last event and at-end event,  would you please give me an example, couldn't thank you more!
     Best regards
    Frank

Answer 1

Hi,
This is very good document for you.
Processing Control Levels
When you sort an extract dataset, control levels are defined in it. For general information about control levels, refer to Processing Internal Tables in Loops The control level hierarchy of an extract dataset corresponds to the sequence of the fields in the HEADER field group. After sorting, you can use the AT statement within a loop to program statement blocks that the system processes only at a control break, that is, when the control level changes.
AT NEW <f> | AT END OF <f>.
ENDAT.
A control break occurs when the value of the field <f> or a superior field in the current record has a different value from the previous record (AT NEW) or the subsequent record (AT END). Field <f> must be part of the HEADER field group.
If the extract dataset is not sorted, the AT... ENDAT block is never executed. Furthermore, all extract records with the value HEX 00 in the field <f> are ignored when the control breaks are determined.
The AT... ENDAT blocks in a loop are processed in the order in which they occur. This sequence should be the same as the sort sequence. This sequence must not necessarily be the sequence of the fields in the HEADER field group, but can also be the one determined in the SORT statement.
If you have sorted an extract dataset by the fields <f1>, <f2>, ..., the processing of the control levels should be written between the other control statements as follows:
LOOP.
  AT FIRST.... ENDAT.
    AT NEW <f1>....... ENDAT.
      AT NEW <f2>....... ENDAT.
          AT <fgi>..... ENDAT.
          <single line processing without control statement>
      AT END OF <f2>.... ENDAT.
    AT END OF <f1>.... ENDAT.
  AT LAST..... ENDAT.
ENDLOOP.
You do not have to use all of the statement blocks listed here, but only the ones you require.
REPORT DEMO.
DATA: T1(4), T2 TYPE I.
FIELD-GROUPS: HEADER.
INSERT T2 T1 INTO HEADER.
T1 ='AABB'. T2 = 1. EXTRACT HEADER.
T1 ='BBCC'. T2 = 2. EXTRACT HEADER.
T1 ='AAAA'. T2 = 2. EXTRACT HEADER.
T1 ='AABB'. T2 = 1. EXTRACT HEADER.
T1 ='BBBB'. T2 = 2. EXTRACT HEADER.
T1 ='BBCC'. T2 = 2. EXTRACT HEADER.
T1 ='AAAA'. T2 = 1. EXTRACT HEADER.
T1 ='BBBB'. T2 = 1. EXTRACT HEADER.
T1 ='AAAA'. T2 = 3. EXTRACT HEADER.
T1 ='AABB'. T2 = 1. EXTRACT HEADER.
SORT BY T1 T2.
LOOP.
  AT FIRST.
    WRITE 'Start of LOOP'.
    ULINE.
  ENDAT.
  AT NEW T1.
    WRITE / '   New T1:'.
  ENDAT.
  AT NEW T2.
    WRITE / '   New T2:'.
  ENDAT.
  WRITE: /14 T1, T2.
  AT END OF T2.
    WRITE / 'End of T2'.
  ENDAT.
  AT END OF T1.
    WRITE / 'End of T1'.
  ENDAT.
  AT LAST.
    ULINE.
  ENDAT.
ENDLOOP.
Reward if useful