Hi Akhile,
Here it is:
Step 1 - Your SCS condition(Z800) type should be created as advance payment without revenue check box ticked.
Step 2 - Assign Reference Flow Types for Receivables/Credit from SCS
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Step 3 - Assign Account symbol to Flow type
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Step 4 - Replace Account Symbols
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This I set up for one of my client and it is successfully working. Try this and quickly keep me posted.
If required, write to me a direct message.
Regards,
Amarendar Kumar