Hello Bhakti
When the approver approves the request - the last step, the workflow is complete from MDG side. The data is updated in MDG tables. For GL - you can check table in MDG. The record should be active in MDG with status 1.
Now on replication - the data is replicated from MDG to ECC using IDOC / SOA or file. You have to configure the replication model to replicate the data in ECC and then you can check it in FSP0.
As you mention, you are replicating the group account. Make sure that the settings are properly done and RFC set up is properly maintained from MDG to ECC system.
Check your replication model first and let me know if you are still facing problem.
Kiran