Problematic syntax error near ")" at line 14: SQL statement - SAP Hana - sql

Question

I am sure that you are used to this question but nonetheless I am having trouble with my SQL script. It is very frustrating.
When I execute the SQL against the SAP Hana database, I continuously receive this error:
Errors occurred while executing the SQL statement: SAP DBTech JDBC: [257]: sql syntax error: incorrect syntax near ")": line 14 col 35
Let me present the SQL concerned here:
SELECT
BKPF.BKTXT, BKPF.MONAT, BSEG.BELNR, BSEG.BUKRS, BSEG.DMBTR, BSEG.GJAHR, BSEG.MANDT, BSEG.PRCTR, BSEG.SAKNR, CEPCT.KTEXT, CEPCT.LTEXT, SKAT.MCOD1, SKAT.TXT20, SKAT.TXT50
FROM
SAPPR1.BSEG
INNER JOIN SAPPR1.BKPF ON BSEG.GJAHR = BKPF.GJAHR
INNER JOIN SAPPR1.CEPCT ON BSEG.PRCTR = CEPCT.PRCTR
INNER JOIN (SELECT
SAKNR, TXT20, TXT50, MCOD1
FROM
SAPPR1.SKAT
WHERE
SPRAS not LIKE '%[a-z0-9 .]%' ) AS SKAT_SUB ON BSEG.SAKNR = SKAT_SUB.SAKNR
WHERE
BKPF.MONAT = (SELECT Month('?')-1)
AND (BSEG.GJAHR = (SELECT Year('?')-1 HAVING Month('?')-1 < 4) OR BSEG.GJAHR = (SELECT Year('?') HAVING Month('?')-1 > 3))
AND BSEG.MANDT = ?
;

Answer 1

Unlike other DBMS HANA does not support selecting records out of nothing.
A SELECT without a FROM is not valid.
In order to create a single-row set one can use the DUMMY table.
SELECT current_date FROM DUMMY;
creates the single-row set with the result of the function expression.
Having said that, for comparisons a set is not required. Instead the function can be directly put into the expression:
WHERE
BKPF.MONAT = (MONTH(?)-1)
Also note that for string typed bind variables no quotation marks are required or allowed.