The transfer of transactions from source systems is pending

Summary:

Im doing month end activity, I'm trying to close April period. but the Validation Exceptions shows "The transfer of transactions from source systems is pending. count 155. How to identify these 155 transactions. is this due to Invoicing ?

I ran All ESS jobs.

1- Transfer Transactions from Receiving to Costing

2- Transfer Transactions from Inventory to Costing 

3- Transfer Costs to Cost Management

4- Import Revenue Lines  >> in case of sales order shipping from FOM

5- Create Receipt Accounting Distributions Available from Receipt Accounting.

6- Create Cost Accounting Distributions. Available from Cost Accounting.

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