SYMPTOM
When multiple answers are provided for SAP HANA input parameter, Strategy generates following SQL:

select a11.DAY_DATE  DAY_DATE,
sum(a11.QTY_SOLD)  WJXBFS1
from "_SYS_BIC"."tutorial/AN_ORDER_DETAIL_CURR"
('PLACEHOLDER' = ('$$INPUT_CURRCY$$', 'EUR'),
'PLACEHOLDER' = ('$$INPUT_DATE_CURR$$', '20030109'),
'PLACEHOLDER' = ('$$INPUT_DATE_CURR$$', '20030113'))
a11
group by a11.DAY_DATE

instead of generating the following expected SQL:

select a11.DAY_DATE  DAY_DATE,
sum(a11.QTY_SOLD)  WJXBFS1
from "_SYS_BIC"."tutorial/AN_ORDER_DETAIL_CURR"
('PLACEHOLDER' = ('$$INPUT_CURRCY$$', 'EUR'),
'PLACEHOLDER' = ('$$INPUT_DATE_CURR$$', '''20030109'', ''20030113'''))
a11
group by a11.DAY_DATE

STEPS TO REPRODUCE:
1. Use a project that uses SAP HANA type Database Instance.
2. In Warehouse catalog, choose a table without input parameter (For ex: tutorial/AV_TIME) and a table with input parameter (For ex: tutorial/AN_ORDER_DETAIL_CURR).
3. Create Attribute "Date" from tutorial/AV_TIME, "Day_Date" from tutorial/AN_ORDER_DETAIL_CURR.
4. Create fact "Qty Sold" from tutorial/AN_ORDER_DETAIL_CURR and create a metric "QTY_SOLD" based on it.
5. Create an Element prompt on Date (the prompt cannot use an attribute that uses a table with input parameter)
6. Find the table tutorial/AN_ORDER_DETAIL_CURR under Schema Objects and edit.
7. Change the prompt type of Parameter "INPUT_DATE_CURR", replace it with the prompt we created in step 5.
8. Update Schema.
9. Create a report with Day_Date and QTY_SOLD, save.
10. Run the report with default Prompt input for "Currency Input" and choose multiple Dates for the second Prompt input.
11. Show SQL for this report and note that one place holder is used for each element (in red below) that was selected. 

select a11.DAY_DATE  DAY_DATE,
sum(a11.QTY_SOLD)  WJXBFS1
from "_SYS_BIC"."tutorial/AN_ORDER_DETAIL_CURR"
('PLACEHOLDER' = ('$$INPUT_CURRCY$$', 'EUR'),
'PLACEHOLDER' = ('$$INPUT_DATE_CURR$$', '20030109'),
'PLACEHOLDER' = ('$$INPUT_DATE_CURR$$', '20030113'))
a11
group by a11.DAY_DATE

CAUSE
 
This is a known issue in Strategy 10.x.
 
ACTION
This issue has been addressed in Strategy 2019 Update 3.
If you are upgrading to Strategy 2019 Update 3 or above, to pick up the fix, enable project level setting "Data Engine Version" to 11. This property can only be enabled through Workstation. For more details on enabling the setting, refer to Change Data Engine Version.

select a11.DAY_DATE  DAY_DATE,
sum(a11.QTY_SOLD)  WJXBFS1
from "_SYS_BIC"."tutorial/AN_ORDER_DETAIL_CURR"
('PLACEHOLDER' = ('$$INPUT_CURRCY$$', 'EUR'),
'PLACEHOLDER' = ('$$INPUT_DATE_CURR$$', '''20030109'', ''20030113'''))
a11
group by a11.DAY_DATE

The Strategy Internal Reference Number for the issue discussed in this technical note is KB483566 and DE72791/DE134159.

Appendix

In Strategy 2019, before Update 3, with Data Engine Version 11, when the user supplies more than 2 values to answer the prompt, there is a syntax error due to incorrect quoting.
SYMPTOM
In the case above, if 3 answers are provided for SAP HANA input parameter, Strategy generates following SQL:

select a11.DAY_DATE  DAY_DATE, sum(a11.QTY_SOLD)  WJXBFS1 from "_SYS_BIC"."tutorial/AN_ORDER_DETAIL_CURR" ('PLACEHOLDER' = ('$$INPUT_CURRCY$$', 'EUR'), 'PLACEHOLDER' = ('$$INPUT_DATE_CURR$$', '''20030109'', ''20030113,''20030109''')) a11 group by a11.DAY_DATE

instead of generating the following expected SQL:

select a11.DAY_DATE  DAY_DATE, sum(a11.QTY_SOLD)  WJXBFS1 from "_SYS_BIC"."tutorial/AN_ORDER_DETAIL_CURR" ('PLACEHOLDER' = ('$$INPUT_CURRCY$$', 'EUR'), 'PLACEHOLDER' = ('$$INPUT_DATE_CURR$$', '''20030109'', ''20030113'',''20030109''')) a11 group by a11.DAY_DATE

Notice that the second value misses the ending quotation mark.
It can cause a syntax error and fail the report. This issue is fixed in Strategy 2019 Update 3 and  Strategy 2020.