What is loop in framework manager? | Cognos

Loop is closed path in reportnet it called as ambiguous relationship. That means a query subject contains multiple paths to retrieve the data. It is an exception to resolve to create a shortcut on that query subject otherwise it displays wrong results in reports and performance is degrades.
An undefined join between two tables is known as loop.To resolve loop delete the joins, if these joins are necessary then we have to create shortcuts nothing but alias tables. Place the joins in alias tables.
A LOOP IS A CLOSED PATH IN FRAME WORK MANAGER DUE TO JOINS.
WE ILL RESOLVED IT BY CREATING ALLIAS AND CREATING SHORT CUTS.