pricing conditions not available with formula 500

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Symptom
When using formula 500 and 501 to calculate US and Canada taxes in CRM using external tax packages, we do not get the pricing conditions in the scenario where billing is done in R/3.
In sm53 logs, a null pointer exception is found with reference to a scale base formula.
Other terms
Vertex, Taxware, Sabrix
Reason and Prerequisites
Scale [...]

Field ACCNT_NO is not populated after you impl. Note 1370080

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Symptom
Field ACCNT_NO is not populated in External Tax Package after implementing note 1370080.
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 IPC patch as
described in note 880749.

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 [...]

Mandatory condition 1TTE is missing

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Symptom
In the scenario where billing is done in CRM, Mandatory condition 1TTE is missing. The following error is also got:
java.lang.ArithmeticException: divide by zero
Other terms
1TTE, Vertex, Taxware, Sabrix
Reason and Prerequisites
Program Error
Solution
For BBPCRM 4.0, this error message can no longer occur as of SP (support package) 17. For any previous version, please install the patch, according [...]