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1. Universe Design –
SAP Business Objects
Resolving Loops – An Overview
from Newyorksys IT
Solutions

2. CONTENTS
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 Use Designer tools to resolve loops using
Aliases and Contexts
 Detect and recognize loops in a universe

3. What is a loop?
A loop exists when the joins between tables form a
continuous path
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4. How to deal with loops
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One of two routines can be used to resolve most loop
situations in the universe structure window.
Alias Detection
Routine
Context Detection
Routine
...and...
Must be done prior to using
detection routines and done
correctly. Otherwise,
routines may recommend
incorrect solution.
Set Cardinality Manually
for All Joins

5. www.newyorksys.com
 Cardinality not set:
 Set Cardinalities:
 Do this manually:

6. What is an Alias ?
» An Alias is an exact duplicate of the original table
with a new name. The data in the table is exactly
the same.
» The Alias is used only to resolve the loop in the
structure of the universe. There is no impact on
the schema of the database
˃ Easy to define
˃ Easy to maintain
˃ Easy to use
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7. When to Alias• A loop with a single
lookup table should be
resolved by an alias
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 A lookup table can be
identified by its cardinality
N N
N
N
N
1 1
1
1
1
 A lookup table only has
the ‘one’ end of joins
attached to it
Alias needed here

8. How to Alias
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 Designer routines
detect loops and
candidates for
aliases
 Break the loop by
creating an alias of
the lookup table for
each side of the loop
 Some designers like
to create an alias for
both sides of the loop.
Do not remove the original
table

9. Detecting and Creating Aliases
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 Use the Alias Detection routine
 Manually insert an alias
 Use the Loop Detection routine
 To create an alias table to break a loop, you can:

10. • Automatic loop detection
• Click the Detect Loops button
• The routine checks the structure for loops
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 The window suggests candidate contexts or aliases

11. Contact us
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