Hi,
First please check the customizing below:
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2, For number range definition of vendors, please refer to the following customizing:
A)
Cross-Application Components > SAP Business Partner > Business Partner
> Basic Settings > Number Ranges and Groupings > Define Number Ranges
Or
Use t-code snro and input object 'BU_PARTNER'.
Here you should define an external number range which corresponds to
the R/3 numbers.
B)
Cross-Application Components > SAP Business Partner > Business Partner
> Basic Settings > Number Ranges and Groupings > Define Groupings and Assign Number Ranges
Or
Use t-code buc2 to check it
For each replication run, you can download the vendors which correspond
to the external number range / grouping which is marked as 'standard external'.
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From your attachment, I don't think they are set correctly.
Meanwhile, please check if ECC vendor exists in SRM table VENMAP and BUT000, and tell me the results.
Regards,
Ivy