Field ACCNT_NO is not populated for External Tax Calculation

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Symptom
The taxes are different in CRM and ECC.The reason is that the value of the field ACCNT_NO for External Tax Package is not populated in standard Formula (300,500,501).
Other terms
Taxware, Sabrix, Vertex, USA, US TAX.
Reason and Prerequisites
Program Error.
Solution
This issue is solved as of SAP_AP 700 SP18.
For the previous releases (SP08 – SP17) apply the latest [...]