I am having troubles with chapter numbering in captions. I am using figures
and tables under Headings 1 through 5. I want the caption numbering to be in
sequence with the Heading number. For example, under Heading 1 (i.e. Heading
1); the tables should read Table 1.A, 1.B, 1.C and the figures should read
Figure 1.A, 1.B, 1.C. Further, under Heading 2 (i.e. Heading 1.1); the
tables should read Table 1.1.A, 1.1.B, 1.1.C and the figures should read
Figure 1.1.A, 1.1.B, 1.1.C.

I am able to insert the Captions and Caption Numbering under Heading 1
correctly(i.e. 1.A, 1.B, 1.C). However, when I insert a Caption under
Heading 2 (with Caption numbering for Heading 2, i.e. 1.1.A, 1.1.B, 1.1.C)
then the previously inserted Captions under Heading 1 are re-numbered with
Caption numbering for Heading 2, i.e. 1.1.A, 1.1.B, 1.1.C.

What am I doing wrong?

I have tried to alter the field codes (ALT+F9) but have no luck.