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BAL_CH_DISPLAY_PRINCIPLE -

BAL_CH_DISPLAY_PRINCIPLE -

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Which information can be displayed?
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You could imagine the set of messages in memory as an extremely wide table with a large number of fields (the data is not saved in this form in memory). The possible fields in this table are:

  • Message line (MSGTY, MSGID, MSGNO, MSGV1, etc.)
  • Message attributes (PROBCLASS, DETLEVEL, etc.)
  • Message context fields
  • Message texts:
  • Formatted message line

  • Field long texts ("Very serious" for problem class 1, etc.)

  • Data of the log header to which this message belongs:
  • Log header data (EXTNUMBER, USER, DATUM, etc.)

  • Log header context fields

  • Log header texts (field long texts)

  • External data inserted by the caller by a callback routine, e.g. the material short text

The displayable fields are listed in the structure BAL_S_SHOW, which does not contain the context fields or external data, which the Application Log cannot know.

How is the data formatted?
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This large dataset must be presented appropriately to the user. The data formatting can be controlled by specifying a profile, which is a caller-defined complex data type (structure BAL_S_PROF), which is passed to the output module BAL_DSP_LOG_DISPLAY, not a user- defined display variant.
The display is based on certain basic assumptions:

  • The messages are presented in a list which contains a subset of the displayable fields, which can be specified in a field catalog (analogously to the ABAP List Viewer) which is in the display profile BAL_S_PROF.
  • Detail information can be called for each message:
  • Message long text

  • Eetended long text or CALLBACK routine

  • Technical information about a message (message type, work area, message number, etc.)

  • You can search for and filter the message set with ABAP List Viewer functions. You can also conveniently restrict the dataset by message type (A, E; W; I/S) in the list header. You can show or hide the I and S messages by clicking on an icon.
  • You can add a hierarchy tree for navigation in what can be a long and confusing list. The tree provides a table of contents for the message set. You can display the messages in a chapter in the list by clicking on a node or pushbutton. You can specify the tree structure in the display profile.






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