Merge Cash Account during Payment

Business Requirement : "Split Liability Account at the time of payment based on invoice number :

Creation of Invoice Batch : Test

In the invoice batch created two invoices :

# Invoice 1 : 100 (Item) and 10 (Tax) = 110

# Invoice 2 : 200 (Item) and 20 (tax) = 220

Now, requirement is to merge the liability at the time of payment based on invoice number :

Client Expectation :

Liability 1 Debit 110 (Item+tax)

Liability 2 Debit 220(Item+tax)

Cash Account Credit 330

As the above requirement  achieved after made the following changes in SLA :

1. For Payment>Liablity>Set Merge DR/CR

2. Change the Journal Line description for Payment> Invoice Identifier for Payment

But now, when i am making a payment following unexpected JE is created :