Looping in Crystal

I am trying to do the following scenario in Crystal. Normally, I would handle it with db Stored Procedures, but I don't have that option with my current data source - SAP ECC tables.

Example structure of report  -

Table1.EmpId   @Is Lead (logic)       Table2.Reports To     @Leader (logic)

1000                      FALSE                        2000                          3000

Logic for Leader field is to be determined-

Step 1 -

For each employee (ex 1000), we first check with a logic if the it is a Lead position - If True then Is Lead is True and Leader is Null

If false, move to Step 2.

Step 2 -

Check if Employee No in the 'Reports To' field (ex. 2000) is a Lead position. If True then Leader field = Reports To

If false, move to Step 3

Step 3 -

Look up who the 'Reports To' Employee reports to (using same logic as before), ex. 3000. Again check if employee 3000 is a lead position. If True, then Leader = 3000. If false, repeat step 2 for Employee 3000.

Repeat until a Lead position is found.

I hope it is clear. Any help is appreciated !