Hi Jurgen,
I have checked and found no entry in all the below three tables.
KNVP
LFA1
KNB1
But it exist in KNA1 which is customer master table.
Below are the steps which I am following.
1. Go to Tcode XD06 and marking the below flags and save the info.
2. Go to SARA Tcode and select object FI_ACCRECV and choose write.
3. Select Variant and give the customer data as below and execute it by providing start date and spool parameters.
4. Now checking the Back ground spool and find the same above error of BP Linked.