I know that incompatibility is the one can anybody please let 
me what are the other problems we face

1)#Multi Value Error
2)Data Synch Error

I know that incompatibility is the one can anybody please let 
me what are the other problems we face

Chasm trap and Fan Traps are the loops which will occur 
while ditecting loops.

Examples of these are:

Chasm Trap:

            Orders
Customer < 
            Sales

When one dimention is having one to many relations with two 
diffrent facts then this loop will occur. To resolve this 
loop we have to use Context to chose the right path for the 
reports to avoid multiple SQL statements.

Fan Tap:

Customer -> orders -> orderlines.

When one customer dimention is having one to many relation 
with orders and then again orders is having one to many to 
relation with orderlines then the loop will occure. To 
resolve this we have to use aliase. Name the second table 
oreders with some other alias name then link with third 
table. Ensure to remove the link between 2nd and 3rd tables.

Hope this will answer your question.

Thanks,
Abdul

select empid,name,depno from table1,table2 where table1.deptno=table2.deptno(+)

select a.empid, a.name, a.deptno from table1 a, table2 b where a.deptno != b.deptno

Use Life Cycle Manager to move reports from DEV to QA

Using the Import Wizard we can migrate the Reports and 
associated repository objects from one env to another 
environment.