Hi Majo,
Try to use the S_ALR_87012332 report. This tcode will display the GL, AP and AR. But if you selected this account for GL option the report won't display because for these items from vendors you've to check in the subledgers as Eli already said.
In case if this account don't has the flag 'display line items' in data master, the items will display in the output report like a FBL1N.
The flag use the program RFSEPA01 to post the items just in the BSIS and BSAS tables e.g GL view. And not for the AP and AR views.
JPA