Gdtyjr

Trying to use space on a page more economically, I developed the idea to arrange graphics as a table being part of a figure. As I still wanted to refer to individual graphics, I also wanted to have captions for each such sub-graphic.

(Only after I had problems, I realized that there does exist a similar mechanism, also named subfigure and subcaption)

(I'm no TeX expert, I only know LaTeX a bit)

The code shown below outputs the references as Text... 1 (1.2) ... 1 ...
Text... 1 (1.3) ... 1, so the sub-caption numbers are wrong, while the main caption number is correct. The intended output is Text... 1.2a (1.2) ... 1.2b ...
Text... 1.3a (1.3) ... 1.3b.

The captions for the example code read (numbers are correct there):

Abbildung 1.1: Caption0

Abb. 1.2a: Caption1a Abb. 1.2b: Caption1b
Abbildung 1.2: Caption1

Abb. 1.3a: Caption2a Abb. 1.3b: Caption2b
Abbildung 1.3: Caption2

So here's the input for this example (use any placeholder graphic for Platzhalter.pdf):

documentclass[a4paper,twoside]report
usepackagegerman
usepackage[latin1]inputenc
usepackagea4
usepackagemakeidx
usepackageshowidx
usepackageamsmath
usepackageurl
usepackagegraphicx
usepackageifthen
%
newcountersubfigureX[figure]
renewcommandthesubfigureXthefigurealphsubfigureX
newcountersavefigure
newcommandgtLab
newcommandgtCap
%
newenvironmentgfxTableCapLab[4][htbp]%
ifthenelseequal#4%
renewcommandgtLab%
renewcommandgtLablabel#4%
ifthenelseequal#3%
renewcommandgtCapfLab%
renewcommandgtCapcaptiongtLab#3%
beginfigure[#1]%
setcountersavefigurevaluefigure%
stepcounterfigure%
begincenter%
begintabular#2%
endtabular%
setcounterfigurevaluesavefigure%
gtCap%
endcenter
endfigure%

%
newcommandgLab
newcommandgCap
%
newcommandgfxCapLab[4]%
ifthenelseequal#4%
renewcommandgLab%
renewcommandgLablabel#4%
ifthenelseequal#3%
renewcommandgCapgLab%
renewcommandgCapparnoindentgLabsubcaption#3%
beginminipage[t]#1textwidth%
centeringincludegraphics[width=textwidth]#2%
gCap%
endminipage%

%
newcommandgfxCap[3]gfxCapLab#1#2#3
%
newcommandsubcaption[1]%
%steprefcountersubfigureX
addtocountersubfigureX1%
small Abb.~thesubfigureX: #1%

begindocument
chapterChap
%
beginfigure
 Test
 captionCaption0
endfigure
begingfxTableCapLablrCaption1label1%
gfxCapLab0.4Platzhalter.pdfCaption1alabel1a
&
gfxCapLab0.4Platzhalter.pdfCaption1blabel1b
endgfxTableCapLab
%
Text...
reflabel1a (reflabel1) ... reflabel1b ...

begingfxTableCapLablrCaption2label2%
gfxCapLab0.4Platzhalter.pdfCaption2alabel2a
&
gfxCapLab0.4Platzhalter.pdfCaption2blabel2b
endgfxTableCapLab

Text...
reflabel2a (reflabel2) ... reflabel2b
enddocument

Specifically pdflatex complains if I uncomment the line %steprefcountersubfigureX (commenting addtocountersubfigureX1 instead):

! Undefined control sequence.
subcaption #1->steprefcounter 
 subfigureX small Abb.~thesubfigureX : #1
l.68 ...0.4Platzhalter.pdfCaption1alabel1a

(Originally I had named my counter subfigure also, but then I discovered that a counter with such a name already exists, so I appended the X).

Preferably the answer contains an explanation why my code does not work (everything that is wrong), how to do it correctly, and (as an extra) how I could achieve the same effect using the stock subfigure and subcaption mechanisms.