In which conditions we can not use joiner transformation (Limitations of joiner transformation)?

In the conditions either input pipeline contains an Update Strategy transformation, you connect a Sequence Generator transformation directly before the Joiner transformation
1.Both input pipelines originate from the same Source Qualifier transformation.        

 2. Both input pipelines originate from the same Normalizer transformation.
3. Both input pipelines originate from the same Joiner transformation.
4. Either input pipeline contains an Update Strategy transformation.
5. We connect a Sequence Generator transformation directly before the Joiner transformation.